In theory, living as you do so close to the exchange you should get the same quality of connection no matter who provides your service. So the answer to your question is yes, there are cheaper ISPs around, but look before you leap, and read other ABRs comments re ISPs. If you are happy with your present service - maybe better to stick with it.
Personally I'm changing from Orange as my 12 month contract is now up, and I shall be looking at Tiscali as my next provider. At �19.99 which includes the BT line rental, I'm off.