Ref post 29. Does this link help?
https://www.rafweb.org/Ranks-Uniform/Ranks6A.htm
Thread drift – I was at Seletar 69-71. That was during the year when the Military pay review gave the Forces a decent pay rise. It was so large that our betters thought us Singlies would p*** it all up against a wall, so the increase for us would be spread over two years. Scalies would get the full amount immediately. Us Singlies were a little bit miffed so we had to commiserate together in the Malcolm Club over the odd pint or two of Tiger.