Should have mentioned I think I got the answer on a Triumph forum. The short of it is that the valves expand slightly when hot and when pulling in the clutch regardless if needed or not it reduces stress on the engine enough for it to start when hot. So the next job I have when I can be arsed are the valve clearances. That will be fun as I have to do all my bike maintenance on the street as I dont have a garage. Ah well, the neighbours are used to seeing me fiddling with me nuts and screws on the road
