Try this postcode checker to see if you should be able to receive it:
http://www.dtg.org.uk/retailer/coverage.html
Then look here to see if you have the correct aerial group:
Digital transmitter network:
http://www.dtg.org.uk/retailer/transmitters.html
Analogue transmitter network:
http://www.bbc.co.uk/reception/trans...ns/index.shtml