INFORMATION:

Portishead is situated on the north Somerset coast. It sits next door to Avonmouth docks and in WW2 a very big petrochemical works, one of the major petrol works in the south. To the batteries left is the town, electricity power station and port of Portishead and on its right is the sprawling dock and petro site of Avonmouth which this AA site defended. Portishead Wikipidia.

OS Ref: ST486765
You can use the Ordnance Survey 'Get a Map' and follow the instructions. Copy and paste the map reference.