Will continue checking down the line - i guess the thing is the transformer made some smoke and burnt a bit when we had nothing connected - just power into the transformer. But as suggested the problem may have occurred further along the line - half stuffed the transformer and now it is continuing to 'cook' even with nothing connected?
That's exactly what I would be wary of.
I have done a bit more reading on fuses and I am still not certain exactly of what the voltage ratings mean, but a 10A fuse in place of 1/8A is a disaster waiting to happen whether it was rated 12V or 240V. Hence the burnt board.
I will try to look at the schematics if they are online so I can better understand what might have happened.
