There are a number of airport radio frequencies at Bristol Airport, you can find them detailed below:

Bristol Radar: 125.650
Bristol Approach: 136.080
Bristol Delivery: 121.930
Bristol Director: 136.075
Bristol ATIS: 126.030
Bristol Tower: 133.850
Bristol Operations: 130.625

As of the 1st March 2018 Bristol left the LARS service, pilots when flying in the vicinity of the Bristol Airspace to squawk 5077 and monitor the Bristol Approach frequency.

ICAO Code: EGGD
IATA Code: BRS