I took the blackcircles route, they do a supply and fit and still manage to undercut virtually all the suppliers in Wolves. I used a mobile mechanic for the last lot but I wasn't overly impressed with the service (or fitters attitude), so I'll be taking it to a garage next time.
When you get your tyres, let me know who you get to fit them and how much, as I might consider the Ebay or Camskill purchase for the next set.