found the problem, faulty coil.
Driving to work this morning is when bad again after driving normal for 10 mins, the coil must of cut out completly going down a hill, i had it in gear trying to start it :) unfortunatly i was pumping the pedal thinking it might of been a fuel blockage .... what a mistake! The coil came to life for a short time, enough to blow the absolute shit out of my exhaust then stoped all together. Myself and the cars around me looked very pale. My exhaust now looks like a ACME product from the road runner cartoon. Anyway got Dad to pop down with some tools and luckly an old coil, which limped the car home.... minus an exhaust. Thanks for your help! Now i get the 2 inch system i wanted!