I've looked closer at the board, the Gary socket is badly corroded and will need to be replaced along with the two 74LS244N's, to sort it all out is going to be in the region of 15 to 20 GBP including replacing all the custom chipset IC sockets, I reckon I will have a go at fixing it.
Fortunately all of the custom IC's are not damaged, the pins on the Gary will clean up OK.
Merlin
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