It’s unconfirmed, but there’s a Twitter post that:
From 1 April 2023 it will be free to apply for a military service record from the MOD. You’ll need to pay the £30 fee if you submit an application before 1 April.
Again, it’s unconfirmed. There’s nothing on the UK government website Get a copy of military service records but it might be worth waiting if you’re wanting to get a records and can wait. It’s unlikely the access restrictions will be changed.
Here’s a source for that tweet.
https://www.gov.uk/get-copy-military-service-records/apply-for-someone-elses-records#:~:text=There's%20no%20fee%20if%20you,an%20application%20before%201%20April.