Im new to this whole thing, but thought I’d share my experience as a member of the Australian Defence Force.
We have a very similar system to the UK it would seem in that all members are required to undergo a hearing test (standard beep test) as part of the recruitment process. You are then categorised into one of four “hearing standards” (HS1-HS4) depending on your results and this will typically determine whether you can be accepted for your chosen career stream.
I believe that almost all jobs in the ADF require a hearing standard of atleast HS1 or HS2 though, as in my situation, they are also able to grant waivers depending on your circumstances. For example, i was recruited as an Engineer with a HS3 (moderate hearing loss <60db across frequencies), which would ordinarily mean that I would be refused entry (HS2 requirement) though, because I was already degree qualified, they sought a waiver for me to enlist.
The benefit for me is that once you are in, they are required to look after you. I had a 5 yearly medical recently which involved a hearing test and found that I had deteriorated to HS4 (>80db loss across frequencies) due to my high frequency loss and (after a couple of months of specialist appointments) the ADF have just shelled out almost $9K for a pair of Phonak Ambra’s that will be fitted next week - my first hearing aids. SO im pretty happy about that.
Anyway, I wish you all the best and hopefully you may find some similar entry paths into the UK police / armed forces as we have down here.