Thanks Mick.
I've tested it again this morning and it still works, amazing.
I'm using your spair front panel. It seems my old one does have some sort of contributing fault, and the brand new one I recieved is completely useless - it blows fuses whenever it's used.
Another new front panel, and complete service kit, is coming, eventually.
It's amazing how many different problems it's had over the last 10 weeks - the progression of one problem to another.
I am quite confident it will now continue to function, until the next lightning strike
Roger.