It fixed itself and made me look like a twit all at the same time !
My mate popped over to borrow my heatgun, I was in the boot trying to sort it, it wasnt work at the point when he turned up. He obviously asked what are you doing in the boot, not quite like that you can imagine a serious wtf moment..... so I demonstrated what the problem was about 35 times ..... it didnt do it !!!!!
So just to make sure it wont happen again for a while I smothered it in wd40 whilst seperating anything that moves, it was a touch corroded but I think the solenoid itself is on its way out as it sound extremely weak.