Blocklisting - Interim Review

MICROGEN PLC 2 JULY 2008 BLOCK LISTING RETURN Name of applicant: MICROGEN PLC Name of scheme: MICROGEN PLC 1997 AND 1999 EXECUTIVE SHARE OPTION SCHEME MICROGEN PLC 1996 SAVINGS RELATED SHARE OPTION SCHEME Period of return: From: 1 JANUARY 2008 To: 30 JUNE 2008 Balance under scheme from previous return: MICROGEN PLC 1997 AND 1999 EXECUTIVE SHARE OPTION SCHEME - 365,500 ORDINARY SHARES OF 5P EACH MICROGEN PLC 1996 SAVINGS RELATED SHARE OPTION SCHEME - 82,291 ORDINARY SHARES OF 5P EACH The amount by which the block scheme has been increased, if the scheme has been increased since the date of the last return: N/A Number of securities issued/allotted under scheme during period: MICROGEN PLC 1997 AND 1999 EXECUTIVE SHARE OPTION SCHEME - 20,000 ORDINARY SHARES OF 5P EACH MICROGEN PLC 1996 SAVINGS RELATED SHARE OPTION SCHEME - 0 ORDINARY SHARES OF 5P EACH Balance under scheme not yet issued/allotted at end of period MICROGEN PLC 1997 AND 1999 EXECUTIVE SHARE OPTION SCHEME - 345,500 ORDINARY SHARES OF 5P EACH MICROGEN PLC 1996 SAVINGS RELATED SHARE OPTION SCHEME - 82,291 ORDINARY SHARES OF 5P EACH Number and class of securities originally listed and the date of admission MICROGEN PLC 1997 AND 1999 EXECUTIVE SHARE OPTION SCHEME - 800,000 ORDINARY SHARES OF 5P EACH MICROGEN PLC 1996 SAVINGS RELATED SHARE OPTION SCHEME - 200,000 ORDINARY SHARES OF 5P EACH 15 APRIL 2005 Total number of securities in issue at the end of the period 102,899,776 ORDINARY SHARES OF 5P EACH Name of contact: PHILIP WOOD Address of contact: FLEET HOUSE, 3 FLEETWOOD PARK, BARLEY WAY, HANTS, GU51 2QJ Telephone number of contact: 01252 772 312 www.microgen.com
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