OldGnome, thanks for your advice.
I have tried your suggestions, but to no avail. In all cases, bar a "reset of all settings" which I have yet to try, the LiNX aid settings (or at least the name) remain irremovable and any profile inaccessible (i.e. does not respond to tap).
By 2. "restart", I assume you mean power cycle. I have also tried rebooting which likewise makes no difference.
By 3 "Click on settings" I assume you mean to enable Bluetooth from within the Accessibility/Hearing Aids tab, which whilst as expected then shows up the LiNX profile, the profile is "greyed out"and non responsive to tap.
You have suggested a phone reset. I have tried Reset Network Settings but this does not remove or allow access to the LiNX profile. I am loathe to "Reset All Settings" which would be a PITA to reinstate, especially as I don't know if the persistence of the LiNX profile (or perhaps its just a residual name without any profile behind it) is in anyway detrimental to performance/function.
Indeed it may be that all that is persisting is the old profile name and the spinning wheel implying it is searching for any MFI aid (as is the case on a MFI virgin IPhone). If I went down the MFI hearing route again and it did not pick up the new aid, then I guess I would have to consider a nuclear option.
BTW, You are correct in your restore supposition. My old IPad was also linked to this LiNX, That IPad has been replace recently with a new IPad which was restored and..... has the irremovable LiNX profile name on it.
Norman