http://www.paulscycles.co.uk
Some real bargains to be had here if you get a 2014 or 2015 model.
I got a 1000 quid bike for 600 and my mate had a 2800 quid bike for 1200.
If your just riding back and forth to work and taff trail then the bikes you put up will do a job but you can get much better spec bikes for a little more, especially if you're savvy and buy an older model.
Then if you decide to get into it a bit more and go mountain biking or on rougher terrain you've got a better spec bike and haven't had to pay that much more.