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(11)

EP 1 668 638 A1

(12)

(43) Date of publication: 14.06.2006 Bulletin 2006/24 (21) Application number: 04727936.9 (22) Date of filing: 16.04.2004

(51) International Patent Classification (IPC):  G11B 20/00(1985.01) G11B 23/40(1968.09) G11B 23/28(1968.09) (86) International application number: PCT/GB2004/001659 (87) International publication number: WO 2004/095447 (04.11.2004 Gazette 2004/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 16.04.2003 GB 0308877 (71) Applicants: Richardson, Martin, John 72 Forest Road Kew Richmond, TW9 3BZ (GB) Fisher, Ronald, Ashley No. 9 Bakers Orchard Wooburn Green Buckinghamshire HP10 OLS (GB) Wiltshire, John, David 27 Stoneham Street Coggeshall Essex CO6 1UH (GB)

(72) Inventors: Richardson, Martin, John 72 Forest Road Kew Richmond, TW9 3BZ (GB) Fisher, Ronald, Ashley No. 9 Bakers Orchard Wooburn Green Buckinghamshire HP10 OLS (GB) Wiltshire, John, David 27 Stoneham Street Coggeshall Essex CO6 1UH (GB) (74) Representative: Johnson, Terence Leslie  Marks & Clerk 90 Long Acre London, WC2E 9RA London, WC2E 9RA (GB)