I'm a little over half way through watching this little gem of a film from the BBC archives of 1969.
Unfortunately, I fear it may only be viewed this side of the pond, but by all means give it a go!
Here's the synopsis:
At a reunion of No. 501 Squadron at RAF Kenley, surviving Battle of Britain pilots gather to swap stories and recall the events of 1940. The 'Man Alive' team also visit some of the squadron members at their current homes and places of work to find out whether being part of such an elite band of men has had a lasting effect on their lives.
http://www.bbc.co.uk/archive/battleofbritain/11401.shtml