I would confirm everything posters have said here. Without my NHS hearing Aids, my life would be very miserable and I would be isolated. Have had these for past twenty years and seen the enormous improvements in them and how the size has got smaller and smaller.
People seem to think that they will get their hearing aids, pop them into their ears and - magically - they will be transported back (hearingwise), to a time many years in the past. It is not like that - as with many other medical miracles, it is down to the wearer to some work with new aids.
Yes, it takes time for the brain to adjust to them, so they need to be worn for increasing amounts of time over, at least, a two week period. If they are not working for any reason,, then need to take them and wearer back to Audiologist for any adjustments.
My Aids, get popped into my ears when I get out of bed each morning, and are taking out when I go to bed at night. We are so fortunate in UK that audiology seems to be one of the few sections of our NHS which still works as it should and no cost to the patient for these wonderful little items.
I can never understand people who quite obviously have hearing loss, happily wear spectacles for their eyes, and refuse to have a hearing test.