General opinion was to drill out the spot welds, a good option but I couldn't see them, so a new plan was formed involving Iain's idea but with no saw as i haven't got one,so much use of the angle grinder ;D
Basically i grinded the edge of the guttering away allowing me too see the two panels, gutters and roof skin. More careful grinding underneath the gutter revealed the spot welds, and then ground them fully away. As a section was released packers were put in holding them apart.

Large sections didn't need grinding as they were rotten


Eventually it was nearly all released and ready to lift off.

And after a bit of a struggle due to access the final bit was released and the roof lifted clears

Some work to do on the frame but not as much as I thought



Quick lunch break and back to clean off the remains of the gutters.