Witness is the 63rd episode of The Bill.
P.C. Ramsey and P.C. Smith are looking after a witness in a court case. Ramsey is amused that the witness, Andrew Pike, has a high opinion of the police and is applying to become a special constable. Ramsey gets bored at the flat, and convinces Pike to have a day out at the dog races. At the track, Ramsey throws a drunk out of the toilets, and Pike takes offence to his handling of the situation and threatens to report him. Smith goes to get a cuppa and Ramsey is watching the race. Pike disappears, and they manage to rescue him just in time. P.C. Edwards is in court, testifying in the case of an assault on a woman. His notes end up in the toilet and the case is dismissed as not proven.