EFT = Elementary Flying Training, the first 'hurdle'. I’ll get shot down for this but it’s similar to PPL plus different navigation techniques, formation and aerobatics. And to a higher standard/stricter tolerance (maybe in some ways closer to CPL therefore).
Stuff you learn for the exams won’t be wrong, but be prepared to study it all over again in more depth for more exams. You won’t get any credit.
The other way round, though, if you qualify as an RAF pilot then conversion to a PPL or CPL is pretty straightforward, and there are RAF Flying Clubs to help you achieve that.