SOURCE: COLT Telecom Group plc

April 25, 2005 10:28 ET

Colt Telecom Group PLC announces - Blocklisting Interim Review

London -- (MARKET WIRE) -- April 25, 2005 --


                             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 2% Senior Convertible Notes due 2005 and 2006

 3.  Period of return: From 22.10.2004 to 22.04.2005

 4.  Number and class of share(s) (amount of stock/debt security) not    
     issued under scheme           23,083,311
     
 5.  Number of shares issued/allotted under scheme during 
     period:                                0


 6.  Balance under scheme not yet issued/allotted at end of          
      period                        23,083,311
    

 7.  Number and class of share(s) (amount of stock/debt 35,646,824
     securities) originally listed and the date of admission; 
                                                        22.10.1999   

Please confirm total number of shares in issue at the end of the period in order
for us to update our records 1,511,151,331


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

Person making return

Name: Caroline Griffin Pain

Position:

Signature:

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