Hi rpb,
For me, ''Beaufighters in the Night'' is unfortunately just not a very good book, few details, combats etc, mostly sqaudron life and anecdotes, which was a shame and disappointed about.
''No Place for Chivalry: RAF Night Fighters Defend the East of England Against the German Air Force in Two World Wars'', is not a bad read. Starts off a bit too 'chatty' and verbose, but settles down to give good accounts of Home Defence in the Eastern counties and NE areas of the UK, from the very early days.
Steve,
You're spot on with GCI coverage in the early days, although there was also coverage in the Midlands and East yorkshire to Liverpool areas.
Below pic is of CH high and low radar coverage around the UK in '39-'40, which is obviously needed for GCI.
Cheers
Shessi