Steve,
The National Archives in Scotland have a bombing survey recording where all bombs dropped up here landed. Entries are made by county on large scale maps.
I imagine the NA at Kew has something similar for England and Wales, but can't remember which file series it's likely to be in.
If you can get hold of the book
AA Command by Colin Dobinson, that has a gazetteer listing all the AA sites in the Merseyside Gun Defended Area, or go to the Defence of Britain project database (
http://ads.ahds.ac.uk/catalogue/coll...blurbs/324.cfm ).