Hi Bibio,
I don't know your situation, so feel free to ignore me.
The first question I would ask is whether you need wheelchair accessibility, or expect to need it in the near future? If you do, try looking at
https://homecountiesaccessiblevehicles.co.uk/
The website might give you some idea of what's available secondhand or for hire. Though I would expect prices north of the border to be a mite bit more competitive.
Just my thoughts,
Keith