Thought I had found it!
The Junk Man
Hancock decides to have a clean out and starts with a drawer of rubbish. But he puts almost everything back! When Sid James calls in the guise of his new profession as a rag and bone man, Miss Pugh sells some of Hancock's treasured possessions to him whilst he is out of the room.
But no......... Shame as I was convinced at the start of the prog. that this had to be it. Very funny though, of course so well worth the listening.