Ok well I tried out the old Race, and it does seem that the "medium" size is the best one for me. Nice bike all round. Unfortunatly I would have to order in the newer Sport version if I wanted to try it, as its not in stock at any local stores, but its essentially the same frame layout, its just lighter.
Weirdly it really is a 3 speed shifter, and a double chainset. So I guess I'd have to be very careful not to try and select a gear that doesnt actually exist. Seems a bit of an odd design choice, guessing it was to save money.
I also checked out the subway 1 and 2, both very nice bikes, you certainly get a lot of bike for your money with disks and all. Just a shame they only come with huge chunky wheels.
Also saw the Boardman MX Sport. Which seems to be the mix between the two. Shame it comes with suspension which weighs it down though, otherwise it'd be ideal.
So far the boardman sport is the frontrunner, followed by the subway (if only because of the price difference), so im going to look closer at them both.
Thanks again guys