I'm not convinced...
My guess is the RNAS continued to operate them until the last flight in October 1919. Any airship ops after 1920 were civilian registered. The RAF wanted nothing to do with them and did not take them on charge. Just my opinion of course but, my beer fund says I am probably correct.
The difficulties are that according to some sources the RNAS ceased to exist on 1 April 1918 while airships continued flying until October 1919. However, there are no records (that I can find) that the RAF ever owned or operated an airship.
Flt Lt was also a RNAS rank, so don't be fooled by that.
We are talking
Rigid Airships here, not balloons. Apologies for any confusion, I thought you would all look at the other thread on AH&N
http://www.pprune.org/aviation-histo...ships-raf.html.