I haven't had chance to check yet but its since I've fitted a K&N 57i cone filter and a power boost valve. I had these off and checked the pipes etc before I put the thread out. The strange thing is that the revs are ok when I start the car, it's just when I'm coming to a standstill. After about 10 seconds at standstill it picks up again.

The manual says theres a base idle adjustment but only Fords can adjust it!!