Something that will be argued about for ever pretty much. Plenty of daytime action took place well into November of course.

Personally, I’ve always thought of the Battle of Britain period timeline to be that of the RAF’s close to 100% commitment to the defence of the UK, i.e. from the surrender of the French on 25th June 1940 through to the start of the RAF going over to more offensive oreintated ops with Circus No1 on 10th Jan 1941.