COLT Telecom Group -- Blocklisting Interim Review


London, June 17, 2003 (PRIMEZONE) -- COLT Telecom Group plc (Nasdaq:COLT) (LSE:CTM):

Schedule 5 Block Listing Six Monthly Return


 To:  Listing Applications
      UK Listing Authority
      Financial Services Authority
      25, The North Colonnade
      Canary Wharf
      London, E14 5HS

Please ensure the entries on this return are typed

1. Name of Company:

COLT Telecom Group plc

2. Name of Scheme:

COLT Telecom Group Warrants

3. Period of Return:

From: 18 December 2003 to 17 June 2003

4. Number and class of share(s) (amount of stock/debt security) not issued under scheme:

606,999

5. Number of Shares issued/allotted under scheme during period:

Nil

6. Balance under scheme not yet issued/allotted at end of period:

606,999

7. Number and class of share(s) (amount of stock/debt securities) originally listed and the date of admission:

9,796,800 Ordinary Shares of 2.5p each listed on 18 June 1997

Please confirm total number of shares in issue at the end of the period in order for us to update our records.

1,507,538,535

Person making return:

Name: Mark A. Jenkins, Company Secretary



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