Hi Glos Guy
I think I’m too long in the tooth now to leave MB but something that put me off going the private way back when (apart from finance) was the adaptions.
In my case they are a steering wheel spinner plus remote controls for controlling the car and also would have been a hoist.
In your case your wife is using a wheelchair but unfortunate for myself back 17 years when it would have been worth my while going private I got the impression that mobility scooters are not considered by HMRC to be mobility devices, I assume because there’s many abled bodied folk who use these to help with walking and not help with a disability. If I remember right mobility scooters and hoist are not as they say, considerable adaptions in the eye’s of the taxman.
I assume that’s because these type of adaptions are easy to removed restoring it to a normal car unlike a WAV type vehicle that is actually altered.
Out of interest what’s your view on this, though of course the rules might have changed a bit since 2008.