Umm...i'd imagine somewhere reputable like MSD would be able to do it, might be worth phoning a few tuners and see what they say!
If you go over on the rsoc board you'll find a lot of information on focus rs's.....there's a guy called 'demon pete' of stanthorne services who specialises in the focus's, if you're within a reasonable distance from him i'd go there as he's supposed to be the best
If you're only running standard boost at the moment you'll want them to monitor your fuelling too as they turn the boost up to make sure it can safely run higher boost, not the best idea to jus tturn it up yourself imo.