Information on this page is updated via a feed from the London Stock Exchange's Regulatory News Service.
FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 14 September 2005 O2 plc Wellington Street Slough, Berkshire SL1 1YP, England (Address of principal executive offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F Form 20-F..X... Form 40-F..... Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. Yes ..... No ..X... If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82 ________ Enclosure: Copy of announcement regarding Blocklisting Interim Review sent to the London Stock Exchange on 14 September 2005 SCHEDULE 5 BLOCKLISTING 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 O2 plc............................................................... 2. Name of scheme O2 Savings Related Share Option Scheme 3. Period of return: From 14 March 2005...To 13 September 2005................................... 4. Number and class of share(s) (amount of stock / debt security) not issued under scheme 40,000,000 Ordinary shares.................................................. 5. Number of shares issued / allotted under scheme during period: 1,784,137............................................................... 6. Balance under scheme not yet issued / allotted at end of period 38,215,863........................................................ 7. Number and class of share(s) (amount of stock / debt securities) originally listed and the date of admission; 40,000,000 ordinary shares, 14 March 2005. Please confirm total number of shares in issue at the end of the period in order for us to update our records 8,764,891,174....................................................... Contact for queries Name Deborah Russell...................................................... Address O2 plc, Wellington Street, Slough SL1 1YP... Telephone 01753 628096....................................................... Person making the return Name Deborah Russell....................................................... Position Secretarial Services Manager.......................................................Signature Deborah Russell....................................................... The FSA does not give any express or implied warranty as to the accuracy of this document or material and does not accept any liability for error or omission. The FSA is not liable for any damages (including, without limitation, damages for loss of business or loss of profits) arising in contract, tort or otherwise from the use of or inability to use this document, or any material contained in it, or from any action or decision taken as a result of using this document or any such material.SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. O2 plc Date: 14 September 2005 By:___/s/ Robert Harwood___ ROBERT HARWOOD Assistant Secretary