Hello CJE:
There is quite a comprehensive description of the briefing process in Jeffrey Ethell and Alfred Price's
Target Berlin - Mission 250: 6 March 1944, if you have access to that publication - it really is a gripping account.
In summary, they indicate:
- initial briefing for all bomber aircrew at Group level, by Group CO, Operations, Intelligence and Met officers
- followed by more detailed briefings for all aircrew specialties ie pilots/co-pilots, navigators, bombardiers, radio operators, gunners
No doubt others can add to the above.
Cheers
Don (Boomerang)