It may well be that the NHS one she has now will be as good as it gets. I dont know. She was told she could have the second one if she wants, but was advised to give just the one a try first.I found the reverse in that my most recent BTE aids from the NHS were better than the private ones in both hearing quality and features.
BTE is an acronym for Behind The Ear
I imagine that the regional NHS use different suppliers. My wifes are not the all singing and dancing ones that Sam describes. But I think they can be linked to her phone, we have not tried as she does not have a problem hearing that, just me it appears.
She also appears to have lost a degree of spatial awareness.
John