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Exhibit 4.11    
  

Confidential
Materials omitted and filed separately with the

Securities and Exchange Commission. Asterisks denote omissions. 

	 
	 	 

	 	 	

 

10
January 2003 

Chris
Efstathiou

VP Global Procurement

Marconi Communications

1000 Fore Drive

Warrendale,

PA 15086-7502

United States of America 

Dear
Chris, 

Global Procurement Agreement of 1st February 2002 between Marconi Communications, Inc.

and Bookham Technology plc ("GPA")  

   

I
am writing to confirm our recent discussions regarding the Marconi minimum purchase commitment under the GPA for the calendar year 2003. We agreed as follows:\ 

	1.
	During
2003 Marconi will place purchase orders to a minimum value according to the following schedule:

	•
	Q1
03: £[**] ($[**])

	•
	Q2
03: £[**] ($[**])

	•
	Q3
03: £[**] ($[**])

	•
	Q4
03: £[**] ($[**]) 

	2.
	Q1's
minimum purchase commitment of: £[**] ($[**]) will comprise:

	•
	[**]
:                                        £
[**]

	•
	[**]
:                                        £
[**]

	•
	[**]
:                                        £
[**]

	•
	[**]
:                                        £
[**]

	3.
	Marconi
will pay the outstanding balance as shown below [**]:

	•
	Abingdon:        £[**]

	•
	Abingdon:        $[**]

	•
	Paignton:          $[**]

The
payment will be made promptly on or before that day without any delay. 

For
complete clarity, compliance with the above will complete Marconi's minimum purchase obligations under the GPA in full. Also, this letter shall extend the initial term of the GPA to
31st December 2003 and clause 8.1 of the GPA shall be deemed amended accordingly. 

Please
sign below to confirm Marconi's agreement to these terms. 

	/s/  CHRISTOPHER EFSTATHIOU      
	 

Christopher
Efstathiou, VP Global Procurement 

   

    

Yours
sincerely, 

	/s/  STEVE TURLEY      
 Chief Commercial Officer	 

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Exhibit 4.11QuickLinks
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Exhibit 10.1    
  

 
 

CONSENT OF INDEPENDENT AUDITORS    
  

        We consent to the incorporation by reference in the Registration Statements (Form S-8 Nos. 333-13388 and 333-13390) of Bookham Technology plc
of the reference to our firm in Item 3 under the caption "Selected Consolidated Financial Data" and of our report dated March 18, 2003 with respect to the consolidated financial
statements of Bookham Technology plc, all included in this Annual Report (Form 20-F) for the year ended December 31, 2002. 

	/s/ ERNST & YOUNG LLP
Ernst & Young LLP
 Reading, England

March 18, 2003

	 	 	 

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Exhibit 10.1

CONSENT OF INDEPENDENT AUDITORSQuickLinks
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Exhibit 10.2    
  

 
 

Consent of Independent Accountants    
  

        We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (333-13390) of Bookham Technology plc of our report
dated March 17, 2003, relating to the financial statements of Bookham Technology plc, which appears in this Annual Report on Form 20-F. We also consent to the reference to us under the
heading "Selected Consolidated Financial Data" which appears in this Form 20-F. 

	/s/ PRICEWATERHOUSECOOPERS
PricewaterhouseCoopers
 West London, England

March 17, 2003

	 	 	 

 
 

Consent of Independent Accountants    
  

        We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (333-13388) of Bookham Technology plc of our report
dated March 17, 2003, relating to the financial statements of Bookham Technology plc, which appears in this Annual Report on Form 20-F. We also consent to the reference to us under the
heading "Selected Consolidated Financial Data" which appears in this Form 20-F. 

	/s/ PRICEWATERHOUSECOOPERS
PricewaterhouseCoopers
 West London, England

March 17, 2003

	 	 	 

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Exhibit 10.2

Consent of Independent Accountants

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Exhibit 10.3    
  

 
 

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
  AS ADOPTED PURSUANT TO
  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002    
  

        In connection with the annual report on Form 20-F of Bookham Technology plc (the "Company") for the period ended December 31, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, Giorgio Anania, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350,
that: 

	(1)
	the
Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

	(2)
	the
information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

	

Dated: March 19, 2003	
 	

 	

/s/  GIORGIO ANANIA      
 Giorgio Anania
 Chief Executive Officer

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Exhibit 10.3

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002QuickLinks
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Exhibit 10.4    
  

 
 

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
  AS ADOPTED PURSUANT TO
  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002    
  

        In connection with the annual report on Form 20-F of Bookham Technology plc (the "Company") for the period ended December 31, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, Stephen Abely, Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350,
that: 

	(1)
	the
Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

	(2)
	the
information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

	

Dated: March 19, 2003	
 	

 	

/s/  STEPHEN ABELY      
 Stephen Abely
 Chief Financial Officer

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Exhibit 10.4

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002<Page>

                                                                    Exhibit 10.6

                      PRAECIS PHARMACEUTICALS INCORPORATED

                       MANAGEMENT INCENTIVE PROGRAM (MIP)

I. INTRODUCTION

     PRAECIS PHARMACEUTICALS INCORPORATED (the "Company") is an organization
that believes strongly in holding executives accountable for reaching - and
exceeding - individual and departmental annual goals. This accountability goes
hand-in-hand with ensuring that managers are appropriately empowered to deliver
on those goals. Additionally, senior managers play an important role in the
achievement of Company-wide goals; contributing to the development/execution of
corporate strategy, as well as driving individual/departmental goal achievement.
As such, a management incentive program ("MIP" or the "Plan") has been adopted
for eligible key senior managers who are not otherwise eligible to participate
in the Company's Executive Management Bonus Plan and who are identified from
time to time by the Chief Executive Officer and/or the Chief Operating Officer
of the Company. The MIP is designed to reward eligible participants for
achievement and over-achievement, as well as to recognize under-achievement by
establishing below-target payout potential.

     The MIP was adopted to reinforce the Company's culture of individual
responsibility and accountability. It also supports homogeneous focus on Company
goals, timely achievement of those goals and clarity of communication of those
goals across the organization. Finally, individual discussions of annual payout
levels will be utilized to ensure clear communication concerning individual and
departmental performance.

II. PROGRAM HIGHLIGHTS

     At the beginning of each year a "target MIP percentage" will be established
for all of the participants in the MIP. Each participant's annual salary will
then be multiplied by the target MIP percentage to establish that individuals
"target MIP payout" for that year. For example, an employee with an annual
salary of $50,000 per year, with a ten percent (10%) target MIP percentage,
would have a $5,000 target MIP payout for the year. This is referred to as a
"TARGET" MIP payout, since each participant has the potential to earn that
amount - but also the potential for earning a higher or lower amount (as
described below). Actual MIP Payouts will be calculated and paid in accordance
with Section III below.

January 2003

<Page>

III. DETERMINATION OF MIP PAYOUT

     Early each year the Company's major goals are established and communicated
to the Company by senior management. These goals then drive the establishment of
each senior manager's individual goals, and the goals of his/her department.
Progress on the achievement of these goals is then reviewed periodically. This
review will include, at a minimum, formal mid-year and end-of-year reviews.
Company-wide and individual performance against established goals, as evaluated
in final end-of-year reviews, will form the basis for each MIP Payout as
follows:

<Table>
<Caption>
                                          Payout Level
   Goals' Achievement Performance:        vs. Target:      Weighting:
   -------------------------------        ------------     ----------
      <S>                                 <C>              <C>
      INDIVIDUAL:                                          60%
      Excellent/Outstanding               150%
      Exceeds/Very Good                   125%
      Target/Meets Goals                  100%
      Meets Most                           50%
      Did not Achieve Goals                 0%

      CORPORATE:                                           40%
      Excellent/Outstanding               150%
      Exceeds/Very Good                   125%
      Target/Met Goals                    100%
      Met Most                             50%
      Did not Achieve Goals                 0%
</Table>

     For example, using a participant whose annual salary is $50,000, with a 10%
target MIP percentage (or $5,000 target MIP payout): If the participant's
performance against Individual Goals (60% weight) is evaluated as "Very Good"
(125% payout) and the Corporate Goals (40% weight) achievement evaluation is
"Met Goals" (100% payout); then the participant's actual MIP Payout will be
$5,750 (or ($5000 X .6 X 1.25) + ($5000 X .4 X 1.0)).

     All awards under the Plan will be paid in cash via the payroll system in
the pay period following the determination of the MIP Payout.

IV. TIMING

January - March    i.    Establishment of Corporate Goals for current year
                   ii.   Establishment of Individual Goals for current year
                   iii.  Review of Individual and Corporate Performance against
                         Goals for prior year
                   iv.   MIP Payouts for prior year
June - July        i.    Mid-year progress review against Goals for current year

January 2003

<Page>

V. ADMINISTRATION/AMENDMENT

     The Plan will be administered by the Vice President, Human Resources. All
MIP Payouts under the Plan will be approved by the Chief Executive Officer
and/or the Chief Operating Officer. The Compensation Committee of the Board of
Directors shall have oversight over Plan administration and shall have the sole
power to amend the terms of this Plan in any manner at any time without the
consent of any participant.

January 2003

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