I eventually got to uncovering this box again and found that the main antenna connection (gold/brass thing) had become unsoldered. I managed to solder the little pin back down so I have reception again. The only problem that remains is a little bit of crackle and I think that is because the little wings (earth I guess) at the side of the connector were also soldered onto the board, but this is impossible to fix well with a conventional soldering iron. I don't know how it would have been done in the first place.
So this will do for the moment, but I'll try to pick up one of the diversity boxes in due course.
Thanks for your help Ian.
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