Remember, he has a Mondeo and is in Greece. While a Duratec engine, a Focus tune probably won't work on his car. He will need to find someone in Europe that works with SCT to develop a tune for him. Besides, you don't see that much power on a stock engine with just a tune.
Without knowing much about your car, its hard to make suggestions for parts. A lot of the bolt-on stuff is engine bay specific, and something made for the Focus might not fit in your engine bay.
I agree with EGZ about the engine bay, although I've looked at a Mondeo, and it's very similar to the Focus. However, a European performance parts supplier in Europe would be the best place to start.
Best of luck with the Mondeo, if the Euro Mondeo is better than the US Focus- which I assume it is since most everything else Ford gets better the further away from the US you get- then you shouldn't have any problems making a Mondeo perform better than a comparable Volkswagen. The UK has lots of parts, but I'd think that something would be available closer- like from Germany.
Click on ford, then non-turbo petrol.
then select mondeo.
then click on your engine.
Just to verify if the BlueFin is available for your car.
I assume it is.
You can purchase it from a site that specializes in european parts.
I however, Cannot mention that european parts website because they are not an affliliate.