Thanks Graham i wish i knew,i had assumed id seen them at brize,fairford or marham but that now seems unlikely.
the oldest book that i still have them noted in was 1987 so no clues as to even the exact year seen although i thought it was around the time i saw these ones
55-0071,55-0080,56-0694 seen 27.04.80 at Marham
56-0606,56-0617,56-0671 seen 25.08.80 at Brize Norton
56-0600,56-0679,56-0690 seen 26-04-81 also Brize
many thanks again for looking