TF
I accept that there are different standards of English and those standards may or may not impinge on whether you are a good pilot, blanket stacker, brain surgeon or whatever. However, we are talking about an RAF Officer. Officer first and foremost, pilot, WSO, PEdO, ATC etc secondarily.
You want to be just a pilot? Fine. Take your skills to any one of a number of different flying outfits. You want to be an RAF Officer? Great. Step up to the crease - but have all the basics that that job requires.
After all that, you may decide that reaching a basic standard of English is just too hard. Perhaps we then need to go back to square one. Train as aircrew but don't become an officer. Be NCO aircrew (although before it all got to be very macho and fashionable we did have LAC aircrew). NCO aircrew, by and large, don't get involved in secondary duties and all the other trappings of 'leadership' (Mind you, for a long time now neither have the majority of commissioned aircrew - but that's another thread - and perhaps has given rise to the feeling that English is purely a luxury).
The RAF is NOT a civilian airline. It has responsibilities as a disciplined service. It has minimum standards which you must meet as a start point. Degrade those minimum standards and you haven't got a fighting service that is running at top notch.
Oh, and by the way, while I was at Cranditz I also graduated a heck of a lot of wannabee aircrew whose English wasn't desperately good - but, they had reasonably good leadership and officer qualities. The RAF was desperate for aircrew in those days! A case of never mind the quality, feel the width! Some of these people are probably now bordering on Air Rank if not there already.