She is a hearing aid user, but they don't appear to be working as well as they used to. With aged parent confusion she cannot remember when she got them. Googling the model numbers suggests aged hearing aids. Besides, they cost a significant fortune, and cost a lot for their annual check up.
So I have got her an Audiology appointment next week, which I shall take her to. That's probably the next step, before going onto the suggestion you made above. Thanks for all your help - most appreciated.
Yes, sounds like some up-to-date audiometery would be prudent, at the very least.
My hearing aids don't appear to have a T setting (and nor do hers that I can see) I wondered if with better tech, the T thing was being phased out gradually?
I think it's more a case of the primary
[1] driving force in hearing aid innovation being to make them as small and invisible as possible, because people are ashamed of hearing impairment (which is a subject that I could rant about at length). Leaving out the pick-up coil is an easy way to make them slightly smaller, especially as most users won't miss it. In some cases it's possible to provide induction pickup for those who want it via an external accessory (barakta used to have a dongle that plugged into the bottom
[2] of her BAHAs for this, and in the new model it's built into the streaming device that connects via The Devil's Other Radio).
As Bluetooth becomes more common as a way to interface telephones with hearing aids, the telecoil becomes relegated to induction loop duties - and as anyone who's ever tried to use an induction loop in a public building will know, they're usually either switched off, the signal is obliterated by interference, are a portable unit with a b0rked battery because nobody ever charged it, or the microphone isn't pointing in the right direction. (This is all exacerbated by staff not knowing what an induction loop is.)
[1] Making speech sound as natural (if not necessarily intelligible) as possible to people with acquired hearing loss is a distant second.
[2] By necessity, it couldn't be built into the unit, as the bone-conduction transducer is a whopping great electromagnet.