I thought I'd give a quick update because I think I have found the root cause and sorted this issue.
Talk about the straw that broke the camel's back. It was an issue I was aware of but ironically didn't think was significant. Just one of those things that I would get around to eventually:-
upload pix
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage