Originally Posted by
EngAl
HD
When I retired I was given to understand that senior officers (Sqn Ldr and above) and their equivalents in the other services could use their rank if they wished. Junior officers could do so, but only after obtaining permission.
A curiosity but I believe flt lt have the right whereas lt and capt don't.
A few years ago there was a letter in the DT by one NS near Grantham who used his rank when he retired decades earlier. The rank was probably relevant to the subject.