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#1657049
This seems the same situation as discussed earlier. :( Standards Document 31 seems to be the definitive document for CAA approved language schools, but as you say there are low single figures of those.

However, the relevant page on the CAA website says:

CAA wrote:Language proficiency testing
There are a number of ways you can be tested for your language proficiency level, as follows:

At your radiotelephony test
A UK approved examiner holding a level 6 proficiency in English can assess you during your practical test for the UK FRTOL. If your language level does not meet a level 6 then you will need to go to an expert assessor, such as a CAA approved language school.

At a flight test
UK CAA approved type rating examiners (TREs), flight examiners (FEs) and class rating examiners (CREs) holding level 6 proficiency in English can assess your English language proficiency level as part of a licence proficiency check for renewal or revalidation of a rating or certificate.

If your language level does not meet a level 6 then you will need to go to an expert assessor, such as a CAA approved language school.

(My bold)

In other words, if you DO meet Level 6 in the opinion of an Examiner then I read that to say you don't need to go to an approved language school.

But then that's what e.g. Sir Morley and others said earlier. It's daft.