I am sure that I have seen a complete listing of RAF Ground Trades and their respective Groups during my research but I am not able to find it in a search anymore. Has anyone got any pointers?

As a follow up, how many times did the listing change during the war?. I think there was a 1940 version but not sure how long that one remained in force.

Finally, could you progress from AC2 through AC1 to LAC in all trades or did some trades restrict how far you could progress?

Any help would be appreciated