Prior to contributing to this thread I had always believed that the ARB - Air Registration Board, approved licenses for air crew and engineers, whilst the CAA just issued the licences. I may have been incorrect. So did the ARB just handle aircraft registrations and airworthiness requirements? Or was there more to it?
I remember attending a building close to London Tower for exams, interviews, etc. for many weeks in 1968 for my LAME licences.