Thanks Guys, I tried the blat for half an hour and have checked the regs and all is well, I've even tweaked the fuel pressure regulator, if anything its worse than before! Looking at the plugs they are very grey meaning that I'm running very lean, I've also whipped out the lambda probe (I think this could be the problem!) it is also very grey/white, should be black?
So, is there any kind soul out there who would mind lending me their K series lambda probe to try and pass the MOT (next Friday), if this works then clearly I will invest in a new probe (£100, ouch). Happy to buy the generous soul a pint.
IAN
PS I'm very local to the Wotton Hatch in Surrey (Guildford) *confused*