I have a pilot who was posted to No.21 Group as an instructor. In 1941 he received a AFC while commanding No.2 Squadron?

I am having problems trying to match No.2 Squadron to 21 Group, can anyone please advice, the info reads:

This was endorsed by the AOC, No.21 Group, on 14 January 1941:

This officer’s devotion to his flying instructional duties merits recognition. Strongly recommended.

An officer with a varied experience of service flying, has been a flying instructor for two years, latterly as Officer Commanding No.2 Squadron. His exceptional ability, both as flying instructor and an administrator, has maintained a very high standard in his squadron. His personality and splendid qualities of leadership have inspired all those under his command.

Any help welcome.