What do you actually mean by "tune up"?

tune as in get it running right, or tune as in change bits to actually take it to a different specification (such as running more boost?)

Either way, talk to Martin Hadland from Reyland Motorsport if you are in the midlands as he is local to you.

Anything you want (and i really do mean anything, lol) he will either be able to do himself or put you in touch with someone else who can.