Hi Scotty,
Many thanks for taking the time to look up all of the details.
Sidney Cotton was long gone from the PRU when Ricketts joined (c.Feb 42, 1 PRU ORB is quite vague, especially wih postings). Ricketts flew with 248 Sqn during the Battle of Britain period.
He received his DFC for a D/A sortie to Billancourt at low level, in appalling weather.
Cheers
Andy Fletcher