COLT Telecom Group plc Announces Schedule 5 Block Listing Six Monthly Return


London, UK, Dec. 21, 2004 (PRIMEZONE) --



                            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 19.06.2004 to 18.12.2004

 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:              0

 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            9,796,800
     of admission;                            18.06.1997

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

                             1,511,048,701

 Contact for queries:                     Address: Beaufort House
 Name: Adrian Goodenough                  15 St. Botolph Street
 Telephone: 020 7947 1677                 London EC3A 7QN

 Person making return

 Name: Adrian Goodenough

 Position:

 Signature:

                This information is provided by RNS
       The company news service from the London Stock Exchange


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Contact for queries:                     Address: Beaufort House
Name: Adrian Goodenough                  15 St. Botolph Street
Telephone: 020 7947 1677                 London EC3A 7QN


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