(19)

(11)

EP 1 102 904 A1

(12)

(43) Date of publication: 30.05.2001 Bulletin 2001/22 (21) Application number: 99936795.6 (22) Date of filing: 28.07.1999

(51) International Patent Classification (IPC)7: E04C 2/04, C04B 28/14, C04B 14/02, B28B 19/00 (86) International application number: PCT/GB9902/472 (87) International publication number: WO 0006/849 (10.02.2000 Gazette 2000/06)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 28.07.1998 GB 9816427 (71) Applicant: BPB plc Slough,Buckinghamshire SL1 3UF (GB)	(72) Inventor: HORSLEY, Stuart, Edward Cropwell Butler,Notts NG12 3AB (GB) (74) Representative: Bass, John Henton  REDDIE & GROSE16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)