I've tried all sorts with it, but its looking more and more like the AFM has had it. I've ordered another one from a breakers that has a warrentee on it (?75 :-( ) but at least if it doesn't work I can send it back and assume I hav another problem.
However I'm getting all the right voltages down the wiring and even after the connecter inside the afm, so really I think I've eliminated all other possibilites.
It should turn up today, but if it doesn't cure this problem, I will be royally stumped.
Cheers for your help guys, I'll let u know how it goes.
