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EXHIBIT 12.1

I, John Jameson White certify that:



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|1. | I have reviewed this annual report on
    Form 20-F for the year ended March 31, 2004 of
    M (2003) plc (the Company);                                                                                                                                                                                                                  
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|2. | Based on my knowledge, this annual report does
    not contain any untrue statement of a material fact or omit to
    state a material fact necessary to make the statements made, in
    light of the circumstances under which such statements were
    made, not misleading with respect to the period covered by this
    annual report;
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|3. | Based on my knowledge, the financial statements,
    and other financial information included in this annual report,
    fairly present in all material respects the financial condition,
    results of operations and cash flows of the Company as of, and
    for, the periods presented in this annual report;                          
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|4. | The Companys other certifying officer and I
    are responsible for establishing and maintaining disclosure
    controls and procedures (as defined in Exchange Act
    Rules 13a-15(e) and 15d-15(e)) for the Company and have:                                                                                                           



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| | (a) | designed such disclosure controls and procedures,
    or caused such disclosure controls and procedures to be designed
    under our supervision, to ensure that material information
    relating to the Company, including its consolidated
    subsidiaries, is made known to us by others within those
    entities, particularly during the period in which this annual
    report is being prepared;
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| | (b) | evaluated the effectiveness of the Companys
    disclosure controls and procedures and presented in this report
    our conclusions about the effectiveness of the disclosure
    controls and procedures, as of the end of the period covered by
    this report based on such evaluation; and                                                                                                          
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| | (c) | disclosed in this report any change in the
    Companys internal control over financial reporting that
    occurred during the period covered by the annual report that has
    materially affected, or is reasonably likely to materially
    affect, the Companys internal control over financial
    reporting; and                                                                                  



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|5. | The Companys other certifying officer and I
    have disclosed, based on our most recent evaluation of internal
    control over financial reporting, to the Companys auditors
    and the audit committee of the Companys board of directors
    (or persons performing the equivalent function):



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| | (a) | all significant deficiencies and material
    weaknesses in the design or operation of internal controls over
    financial reporting which are reasonably likely to adversely
    affect the Companys ability to record, process, summarize
    and report financial information; and
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| | (b) | any fraud, whether or not material, that involves
    management or other employees who have a significant role in the
    Companys internal control over financial reporting.                                                                                                        

Date:
October 8,
2004



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| | /s/ JOHN JAMESON WHITE          
| | Name:  John Jameson White       
| | Title:   Chief Executive Officer