Yes I got in contact with collins....they said "Most Focus RS's have an ECU with the code 6MYD. The chip should be fine but you may come across the problem that Ford reprogrammed the majority of the ECU's, if for some reason it hasn't been reprogrammed, it may not work."

I'm assuming thats the AE/AF map possibly??

Thanks for your advice mate! I'll have to take great care in fitting it!!