The forensic examination of the lead pipes found at the murder scene and in the Corsair's boot revealed traces of blood on the pipe from 46 Lower Belgrave Street. This proved to be a mixture of Lady Lucan's (blood group A) and Sandra Rivett's (B) blood. Hair belonging to Veronica Lucan was also found on that pipe, but none belonging to Sandra Rivett. The pipe found inside the car had neither blood nor hair on it. Home Office scientists were unable to prove conclusively that both pipes were cut from the same, longer, piece of piping, although they thought it likely.