It was Chris O'Dea at Derek Woodmans in Blackpool - Its ok to advise on things like that, as Derek Woodman are not directly advertising.
Note that the price differs from Coupe to Saloon, mine was a Saloon which is traditionally more expensive.
The kit has been as low as £215 for a Coupe, but it seems that the cheapest you could get it now is about £250 for a Coupe and £270 for the Saloon. This is because the Saloon comes with significantly more plastic.
The Saloon came with polystyrene inserts for behind the tweeter which prevents wind noise, it seems a lot of Coupe owners have not received the same foam pieces, so be sure that if yours is a Coupe you ask Chris if its included or not - He is a nice bloke, helpful and will be happy to do all he can to find out.
Tell him Matt pointed you that way, or RCUK (cant remember his real name) as he has supplied a few of us from here with this kit.