when was the shotgun an balclaa found was it straht ater the murder
From the Guardian article.
A gun and balaclava were found behind a pub in Thornaby, 30 minutes away from the post office, but police quickly decided it was irrelevant. The murder weapon, a metal bar, was only found several days after the murder, on top of a high wall nearby. The jury heard it was contaminated by the police officer who handled it, and may have sneezed on it.
Garbutt claims that unbroadcast footage filmed by Tyne Tees television the day after the murder showed the weapon was not there, meaning someone put it there later, when he had gone to stay with his sister many miles away.