this thread stinks of TSR doesn't it? lol
probably not, unless they were trying to decide between you and somebody who was very similar to you.
I have a Cambridge offer with four, so: not to any extent that is worth concerning yourself over.
I got 6 B's and I got a place to do Law (at Liverpool) and 2 medical school interviews (UEA and Soton) - different application cycles obviously =].
I have to say, yes. The top 10 universities in the country only take the elite. The elite don't do Bs.
Not as much as everyone on here makes out, no.
What subject was the B in? If it's not related to the subject you wish to puruse at degree level then it should'nt affect you too much.
However if your aiming for Medicine, they score the application on GCSEs, and more A*/As the greater the chances of a application succeeding. Similarly for Law or any other top 5 dept for your chosen subject it may affect you. You have your AS-Levels to impress them too, so don't worry too much.