Oops!

[servicepub (RIP)]

Originally posted by Bruce Parker
Note also the final "T" in the serial. Odd, and could it signify 'test' like aircraft that had a "G" for guard when secret stuff was on board.

I seem to remember reading somewhere at Archives that tanks which, under special authorisation, were retained for Training but which were not part of the unit's War Establishment had the letter "T" appended. There is also an "R" suffix that is seen on Churchills but I can't remember what it represents.