I have no idea where this page is going to...hopefully somebody will find it 
. I'm not very computer savy...
Anyways, if you still haven't gotten a bike, and want one...you can buy new ones at Halford (right at the corner of St. Andrew's St and Jesus Lane I think?, and close to Sainsbury). They have a relatively cheap deal going on...so it's 79.99 pounds for just the bike but you can pay an extra 20 pounds for lights, lock, and mudguards. So it's only 20 pounds or so more than a used bike, and you could probably sell it to next year's kids for a decent price. All right, hope that's useful.
Alice
Also would suggest checking out the bike shop at the turn around at the intersection of Newnham Road and Fen Causeway. Got a used bike for 50 GBP (no lights, helmet, or lock), and it has been running well. They have a twenty-eight day return policy as well. Central bikes is what it is called, I think...
MZ
I just bought a new bike at Mikes Bikes (28 Mill Road) - it's not that far out (just past Parker's Pieces). I got a new (men's) bike for 89.99 – it was 69.99 for the bike + 20.00 for lights, mudflaps, and lock. Not a bad deal - the bike is a little squeaky so far.. but it works
-Laura