Last time I was involved with such matters, you could not obtain the recordings, you could only obtain a transcript from an approved transcript provider, which was as expensive as you would expect and had to be signed off by the judge. Obviously, making your own transcript, which might show what the judge actually said, is a very serious criminal offence.
HMCTS seem to good at one thing, and one thing only - that is saving HMCTS money at the expense of those that have to use HMCTS.