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As @TW says, or just call the non emergency number and ask for advice. The police are used to things like this.
When doing their loft conversion my neighbour found a fully functioning ww2 era mp40 submachine gun, complete with a couple of hundred rounds of live ammunition hidden in the eaves. The previous owner was a retired austrian policeman, had passed away in the house so his relatives had just cleared it and sold it. The police didn't really care about the circumstances of how it got there. They were more concerned that a firearms officer ensured the gun was safe before it was moved so that there wouldn't be an accidental discharge while it was being taken away.
Bobbo
....aaaand just found a carrier bag full of what looks like unused but rusty (!) shotgun cartridges in the garage....