i use a guy up here called dent master as i cant walk past my car if it has a ding on any of the panels. took out a cracker of a dent on my ibiza, even under a light you couldn't see it had been there, only 35 quid for the first panel and 25 quid for every panel after that.
 
i used Dentex the other week had a dent on each wing i'm very fussy and now you really can't see a thing and it was only £50 well worth it !

Where are they based?