Holding(s) in Company

Diploma PLC
11 December 2006


Letter to Diploma 
Dated 07 December, 2006

Companies Act 1985 ('The Act') - Part VI

I hereby inform you that as at 06-December-06 Barclays PLC, through the legal
entities listed on the attached schedule, has a notifiable interest in the
capital of your Company of 7.56 %

Details of this interest, together with a breakdown between registered holders
(as required by Section 202(3) of the Act), are enclosed.

The issued capital of 22,647,911 is the latest figure available to us.

From Barclays Compliance




                         LEGAL ENTITY REPORT

DIPLOMA                                                        SEDOL: 0182663

As at 06 December 2006 Barclays PLC through the legal entities listed below, had
a notifiable interest in 1,711,455 ORD GBP0.05 representing 7.56% of the issued
share capital of 22,647,911 units.

Legal Entity                                                  Holding          Percentage Held

               
Barclays Capital Securities Ltd                               429,442           1.8962
Barclays Life Assurance Co Ltd                                184,437            .8144
Barclays Global Investors Ltd                               1,097,566           4.8462

                                Group Holding               1,711,455           7.5568  


                                        
 

                         REGISTERED HOLDERS REPORT

DIPLOMA 
                                                                  SEDOL: 0182663

As at 06 December 2006 Barclays PLC through the registered holders listed below,
had a notifiable interest in 1,711,445 ORD GBP0.05 representing 7.56%% of the
issued share capital of 22,647,911 units.

Registered Holder                        Account Designation             Holding

Barclays Capital Nominees Ltd                                          429,442
CHASE NOMINEES LTD                             16376                    12,486
CHASE NOMINEES LTD                             20947                   772,708
CHASE NOMINEES LTD                             21359                    69,049
CHASE NOMINEES LTD                             28270                    28,438
JP MORGAN (BGI CUSTODY)                        16331                    28,640
JP MORGAN (BGI CUSTODY)                        16341                    76,144
JP MORGAN (BGI CUSTODY)                        16344                    17,730
JP MORGAN (BGI CUSTODY)                        16345                    33,485
JP MORGAN (BGI CUSTODY)                        16400                   123,079
JP MORGAN (BGI CUSTODY)                        16482                   102,569
JP MORGAN (BGI CUSTODY)                        18409                    17,675
                                

                                                         Total       1,711,445

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