Cross References:BS 476-20:1987BS 476-21:1987BS 476-22:1987 BS 476-23:1987BS 5990:1990BS 5990/A1:1990 BS 5991:1989BS 7671:2001BS EN 525:1998BS EN 621:1998BS EN 1020:1998BS EN 1196:1998BS EN 60079-10:2003EH 40:2002IGE/UP/2LPGA Code of practice No. 22:1996BS 5440-1:2000BS 5440-2:2000BS 5588BS 5720:1979BS 5854:1980 BS 5925:1991BS 6501:2004BS 8313:1997BS EN 437:2002CR 1472:1997PD CR 1749:2001Gas Appliances (Safety) Regulations 1995Gas Safety (Installation and Use) Regulations 1998Building Regulations 2000Building Regulations (Northern Ireland) Statutory Rules 2000Building Standards (Scotland) Regulations 1990Building Regulations Approved Document JBuilding Regulations Approved Document L2Water Supply (Water Fittings) Regulations 1999Health and Safety at Work etc. Act 1974Electricity at Work Regulations 1989HSE L56:1998IM 28:1993LPGA Code of practice No. 24.6 LPGA Code of practice No. 24.5Dangerous Substances and Explosive Atmospheres Regulations 2002Clean Air Act Memorandum, 3rd edition 1956IGE/UP/1:1995IGE/UP/1A:1998