If you are going to get it done regularly for track use / fast road or you change a lot of parts, invest in some equipment yourself. You soon earn the money back. My stuff was bought of Ebay for 400 quid. I've saved that in 6 months by doing it myself everytime I change a part , go too a different track.
Demon Tweaks are awesome if you want someone to do it for you.
ETS in Derby are shite.