Gradual hearing loss (WIWOL) necessitated hearing aids. Being overseas two units were bought privately; however on the return to the U.K. several years later, a GP referred NHS assessment replaced both units with the latest Phonak external / tube system at no cost. These are far better than the private units and well supported by the NHS, free batteries, etc.
Ms P now has similar systems, however with differing requirements there is no agreeable level of TV volume.
NHS recommended seeking advice from the charity ‘Deaf Direct’ (Hereford / Worcester area).
Their advice has been magnificent, recommending and testing a solution covering independent TV volume (for an old type of TV), telephone, PC, iPad.
This involved purchase of a remote mic and amplifier unit, loop system, with independent volume and tone control (discount via DD), and free NHS activation of the loop control function in the aids - weekly drop in, maintenance and repair service as required.
Suggest contact GP - NHS, choose a system with loop option and adjustable volume if offered (no need to activate these immediately). For specialist options, discuss with DD or similar; or even start with them re NHS.