I've managed to sort out the issue but still couldn't find the source. As previously stated every time I put the main beam on the spotlights would come on and would only switch off if I switched the lights off however, I had a H4 HID kit lying around which I had been given so I thought I'd give them a try. Works perfect, side, dipped and main beam and spots now switch on and off when they should.
So now I have not only fully working lights but HID.
HID lights are illegal on classic minis as HID lights must have levelling motors and also lens wash...