I've just received an e-mail from my mate, thought you guys might like to know that he passes on his thanks

Malc...really looks like I've given you guys something to think about with this one. Thank them for their efforts will you and just for the record the car is a 1995 Vauxhall Corsa 1.2 injection...LS
I've programmed the PIC with Darrels code and will build the circuit over the weekend as he doesn't have them to hand

Thanks guys for your help, hopefully it will be positive news when he receives it and fits it to his wifes car