Summarize the following court judgment. vil Appeal No. 3212 of 1979 etc. From the Judgment and Order dated 20.8.1979 of the Delhi High Court in Civil Writ Petition No. 426 of 1978. PG NO 927 Rajinder Sachar	 G.B. Pai	 Narayan Shetty	 K.T. Anantharaman	 Mrs. P.S. Shroff	 section Shroff	 Ms. Girija Krishan	 C.C. Mathur	 A.M. Mittal	 D.N. Mishra	 Dalbir Bhandari	 Ms. C.K. Sucharita and Ms. A. Subhashini for the appearing parties. The Judgment of the Court was delivered by DUTT	 J. Of these three appeals by special leave. we may first of all deal with Civil Appeal No. 3214 of 1979 for. admittedly	 the disposal of that appeal will virtually mean the disposal of the other two appeals. The said Civil Appeal No. 3214 of 1979 is directed against the judgment of the Delhi High Court whereby the High Court has quashed a circular dated March 8	 1978 issued by the Board of Directors of Caltex Oil Refinery (India) Ltd. (for short `CORIL ')	a Government Company	 on the writ petition filed by the employees of CORIL being Writ Petition No. 426 of 1978. The Caltex (Acquisition of Shares of Caltex Refining (India) Ltd. and of the undertakings in India of Caltex (India) Ltd.) Act 17 of 1977	 hereinafter referred to as `the Act '	 was enacted by the Union Parliament and came into force with effect from April Z3. the Act provides for the acquisition of shares of CORIL and for the acquisition and transfer of the right	 title and interest of Caltex (India) Ltd. in relation to its Undertakings in India with a view to ensuring co ordinated distribution and utilisation of petroleum products. Under section 3 of the Act	 the share in the capital of the CORILS stood transferred to and vested in the Central Government On the appointed day being December 30	 1976. Under section 5	 the right. title and interest of Caltex (India) Ltd. in relation to its Undertakings in India stood transferred to and vested in the Central Government on the appointed day. Section 9 of the Act provides that the Central Government may by a notification direct that the right	 title and interest and the liabilities of Caltex (Inida) Ltd. in relation to any of its Undertakings in India shall	 instead of continuing to vest in the Central Government	 vest in the Government Company either on the date of the notification or on such earlier or later date not being a date earlier than the appointed day	 as may be specified in the notification. Section 11(2) provides that subject to rules made in this behalf under section 23	 every whole time officer or other employee of CORIL would on the appointed day continue to be an officer or other PG NO 928 employee of CORIL on the same terms and conditions and with the same rights to pension	 gratuity and other matters as are admissible to him immediately before that day and shall continue to hold such office unless and until his employment under CORIL is duly terminated or until his remuneration and conditions of service are duly altered by that company. The Chairman of the Board of Directors of CORIL issued the impugned circular dated March 8	 1978	 inter alia	 stating therein that consequent upon the take over of the Caltex (India) Ltd. by the Government	 the question of rationalisation of the perquisites and allowances admissible to Management Staff had been under consideration of the Board for sometime	 and that as an interim measure	 the Board had decided that the perquisites admissible to the Management Staff should be rationalised in the manner stated in the said circular. At this stage	 it may be mentioned that by the Caltex Oil Refinery (India) Ltd. and Hindustan Petroleum Corporation Ltd. Amalgamation Order	 1978 which was published in the Gazette of India	 Extraordinary	 dated May 9	 1978	 the Undertaking of CORIL was transferred to and vested in Hindustan Petroleum Corporation Ltd. which thus became a Government Company referred to in section 9 of the Act. After the issue of the said circular	 the respondent 's Nos. 1 to 4	 who were some of the employees of CORIL	 filed a writ petition in the Delhi High Court being Civil Writ Petition No. 426 of 1978 challenging the legality and validity of the impugned order. It was submitted by the said respondents that under the said circular the terms and conditions of service of the employees of CORIL had been substantially and adversely altered to their prejudice. At the hearing of the said writ petition before the High Court it was contended on behalf of the respondents Nos. I to 4 that the notification issued under section 9 of the Act vesting the management of the Undertakings of Caltex (India) Ltd. in CORIL was ultra vires subsection (1) of section 9. It was contended that the provision of subsection (1) of section 11 of the Act offended against the provisions of Articles 14	 19 and 31 of the Constitution of India and	 as such	 it should be struck down. Further	 it was contended that there was no valid classification between the contracts referred to in section 11(1) and Section 15 of the Act. It was urged that unguided and arbitrary powers had been vested in the of official by sub section (1) of section 11 for the PG NO 929 alteration of the terms and conditions of service of the employees. Besides the above contentions	 another contention was advanced on behalf of the respondents Nos. 1 and 4	 namely	 that the employees not having been given an opportunity of being heard before altering to their prejudice the terms and conditions of service	 the impugned circular should be struck down as void being opposed to the principles of natural justice. All the contentions except the last contention of the respondents Nos. 1 to 4 were rejected by the High Court. The High Court	 however	 took the view that as no opportunity was given to the employees of CORIL before the impugned circular was issued	 the Board of Directors of CORIL acted illegally and in violation of the principles of natural justice. In that view of the matter	 the High Court quashed the impugned circular. Hence this appeal by special leave. It is not disputed that the employees were not given any opportunity of being heard before the impugned circular dated March 8	 1978 was issued. It is	 however	 submitted by Mr. Pai	 learned Counsel appearing on behalf of CORIL	 that there has been no prejudicial alteration of the terms and conditions of service of the employees of CORIL by the impugned circular. It is urged that nothing has been pleaded by the respondents Nos. 1 to 4 as to which clauses of the impugned circular are to their detriment. The High Court has also not pointed out such clauses before quashing the impugned circular. It appears that for the first time before us such a contention is advanced on behalf of CORIL. In this connection we may refer to an observation of the High Court Which is "Admittedly	 the impugned order adversely affects the perquisites of the petitioners. It has resulted in civil consequence". The above observation clearly indicates that it was admitted by the parties that the impugned circular had adversely affected the terms and conditions of service of the respondents Nos. 1 to 4 who were the petitioners in the writ petition before the High Court. Mr. Sachhar learned Counsel appearing on behalf on the respondents spondents Nos. 1 to 4. has handed over to us a copy of the writ petition filed by the respondents Nos. 1 to 4 before the High Court being Civil Writ Petition No. 426 of 1978. In paragraph 12 of the writ petition it has been inter alia stated as tollows: "The petitioners respectfully submit that under the said circular the terms and conditions of service of the employees of the second respondent including the petitioners herein have been substantially and adversely altered to the PG NO 930 prejudice of such employees. The same would be clear inter alia from the statements annexed hereto and marked as Annexure IV. " Annexure IV is a statement of Annual Loss in Remuneration Income per person/employee posted at Delhi and U.P. Nothing has been produced before us on behalf of CORIL or the Union of India to show that the statements contained in Annexure IV are untrue. In the circumstances	 there is no substance in the contention made by Mr. Pai that there has been no prejudicial alteration of the terms and conditions of service of the employees of CORIL	 and that nothing has been pleaded by the respondents Nos. 1 to 4 as to which clauses of the impugned circular are to their detriment. On of the contentions that was urged by the respondents Nos.1 to 4 before the High Court at the hearing of the writ petition	 as noticed above	 is that unguided and arbitrary powers have been vested in the official by sub section (1) of section; 11 for the alteration of the terms and conditions of service of the employees. It has been observed by the High Court that although the terms and conditions of service could be altered by CORIL	 but such alteration has to be made `duly ' as provided in sub section (2) of section 11 of the Act. The High Court has placed reliance upon the ordinary dictionary meaning of the word duly ' which. according to Concise Oxford Dictionary	 means rightly	 properly	 fitly ' and according to Stroud 's Judicial Dictionary Fourth Edition	 the word `duly means 'done in due course and according to law '. In our opinion	 the word `duly ' is very significant and excludes any arbitrary exercise of power under section 11(2). It is now well established principle of law that there can be no deprivation or curtailment of any existing right	 advantage or benefit enjoyed by a Government servant without complying with the rules of natural justice by giving the Government servant concerned an opportunity of being heard. Any arbitrary or whimsical exercise of power prejudicially affecting the existing conditions of service of a Government servant will offend against the provision of Article of the Constitution Admittedly	 the employees of CORIL were not given an opportunity of hearing or representing their case before the impugned circular was issued by the Board of Directors. The impugned circular was therefore	 be sustained as it Offends against the rules of natural justice. It is	 however	 contended on behalf of CORIL that after the impugned circular was issued	 an opportunity of hearing was given to the employees with regard to the alterations made in the conditions of their service by the impugned PG NO 931 circular. In our opinion	 the post decisional opportunity of hearing does not subserve the rules of natural justice. The authority who embarks upon a post decisional hearing will naturally proceed with a closed mind and there is hardly any chance of getting a proper consideration of the representation at such a post decisional opportunity. In this connection	 we may refer to a recent decision of this Court in K.I. Shephard & Ors. vs Union of India & Ors.	 JT 1987 (3) 600. What happened in that case was that the Hindustan Commercial Bank	 The Bank of Cochin Ltd. and Lakshmi Commercial Bank	 which were private Banks	 were amalgamated with Punjab National Bank	 Canara Bank and State Bank of India respectively in terms of separate schemes drawn under section 45 of the Banking Regulation Act	 1949. Pursuant to the schemes	 certain employees of the first mentioned three Banks were excluded from employment and their services were not taken over by the respective transferee Banks. Such exclusion was made without giving the employees	 whose services were terminated	 an opportunity of being heard. Ranganath Misra	 J. speaking for the Court observed as follows: "We may now point out that the learned Single Judge of the Kerala High Court had proposed a post amalgamation hearing to meet the situation but that has been vacated by the Division Bench. For the reasons we have indicated	 there is no justification to think of a post decisional hearing. On the other hand	 the normal rule should apply. It was also contended on behalf of the respondents that the excluded employees could now represent and their case could be examined. We do not think that would meet the ends of justice. They have already been thrown our of employment and having been deprived of livelihood they must be facing serious difficulties. I here is no justification to throw them out of employment and then given them an opportunity of representation when the requirement is that they should have the opportunity referred to above as a condition precedent to action. It is common experience that once a decision has been taken. there is a tendency to uphold it and a representation may not really yield any fruitful purpose. " The view that has been taken by this Court in the above observation is that once a decision has been taken	 there is a tendency to uphold it and a representation may not yield any fruitful purpose. PG NO 932 Thus	 even if any hearing was given to the employees of CORIL after the issuance of the impugned circular	 that would not be any compliance with the rules of natural justice or avoid the mischief of arbitrariness as contemplated by Article 14 of the Constitution. The High Court. In our opinion was perfectly justified in quashing the impugned circular . In the result	 Civil appeal No. 3214 of 1979 is dismissed. In view of the reasons given in Civil Appeal No. 3214 of 1979	 Civil Appeal No. 3518 of 1979 is also dismissed. Civil Appeal No. 3212 of 1979 has been preferred by the writ petitioners in civil Writ Petition No. 426 of 1978 filed before the High Court. The writ petitioners succeded in getting the impugned circular quashed by the High Court. As the High Court rejected some of the grounds of challenge to the impugned circular	 the appeal has been preferred. There is no merit in this appeal and it is wholly misconceived. The appeal is	 therefore	 dismissed. There will be no order as to costs in any of these appeals. M.L.A. Appeal dismissed.

The Caltex (Acquisition of Shares of Caltex Refining (India) Ltd. and of the Undertakings in India of Caltex (India) Ltd.) Act 17 of 1977. by Section 3 provides for the acquisition of shares of Caltex Oil Refinery (India) Ltd. (for short CORIL). Section 11(2) of the Act provides that subject to rules made in this behalf under section 23	 every whole time officer or other employee of CORIL would	 on the day of acquisition	 continue to be an officer or other employee of CORIL on the same terms and conditions and with the same rights to pension	 gratuity and other matters as are admissible to him immediately before that day and shall continue to hold such office unless and until his employment under CORIL is duly terminated or until his remuneration and conditions of service are duly altered by that company. Consequent upon the taking over of the CORIL on December 30	1976	 the Chairman of the Board of Directors of CORIL issued a circular dated 8th March	 1978 to the effect that the perquisites admissible to the management staff of CORIL should be rationalised in the manner stated in the said circular. At this stage the undertaking of CORIL was transferred and vested in the Hindustan Petroleum Corporation Ltd. the appellant in C.A. No. 3214 of 1979. Respondent Nos. 1 to 4	 employees of CORIL in the said appeal	 filed a writ petition before the High Court challenging the legality and validity of the impugned PG NO 925 PG NO 926 circular on the ground	 inter alia	 that the employees had not been given any opportunity of being heard before altering to their prejudice the terms and conditions of service and therefore the impugned circular should be struck down as void being opposed to the principles of natural justice. The High Court accepted the aforesaid contention of the respondents and quashed the impugned circular. Hence this appeal by special leave. Civil Appeal 3212 of 1979 has been preferred by the respondents. Dismissing the appeals	 HELD: 1. The High Court was perfectly justified in quashing the impugned circular. Even if any hearing was given to the employees of CORIL after the issuance of the impugned circular that would not be any compliance with the rules of natural justice or avoid the mischief of arbitrariness as contemplated by Article 14 of the Constitution. [932A B] 2(i) It is now a well established principle of law that there can he no deprivation or curtailment of any existing right	 advantage or benefit enjoyed by a Government servant without complying with the rules of natural justice by giving the government servant concerned an opportunity of being heard. Any arbitrary or whimsical exercise of power prejudicially affecting the existing condition of service of a government servant will offend against the provision of Article 14 of the Constitution.[930F G] 2(ii) The post decisional opportunity of hearing does not subserve the rules of natural justice. The authority who embarks upon a post decisional hearing will naturally proceed with a closed mind and there is hardly any chance of getting a proper consideration of the representation at such a post decisional opportunity.[931A B] K.I. Shephard & Ors. vs Union of India & Ors.	 JT 1987 600	 followed. In view of the reasons given in the above appeals	 the Court dismissed C.A. No. 3518 of 1979. [932C]