1. Central Research and Support Establishment, Home Office Forensic Science Service, Aldermaston, Reading, Berkshire, RG7 4PN
2. Department of Biochemistry, Kings College, University of London, Strand, London, WC2R 2LS
3. Toxicology Unit, Department of Cardiological Sciences, St George's Hospital Medical School, Cranmer Terrace, Tooting, London, SE17 0RE