Hi Gavin, I also have mobility issues, I have 2 mobility scooters, a big I use for getting around locally, I recently got a TGA Breeze 4 second hand. I am still sort of checking it out, so I have done 15 miles on it without a charge and there was still plenty in the battery according to its indicator. I live in Bournemouth so there are a few places I can go locally.
I also have a small scooter in the back of the car, I have to assemble as it wont go in the car in one piece, so I have used it for flying in other spots I can drive to, as long as there is a decent path to a take off point it is fine, it copes on hard compacted gravel but not on loose gravel or sand, and it is fine on grass as long as it is dry.
It does limit the places you can go, but if you get as close as you can with the car its not so bad. As long as you can still see the drone then you can get to lots of spots by flying there.
Obviously I don’t know where to fly in your area, but one thing I did was to look on Google maps using the satelite mode and zoom in to see what pathways looked like, you could use Google Earth as well. I certainly found it helpful as you could have a good look to see if it would be ok for the scooter.
At the end of the day I would say just get out there and see what suits and what doesn’t. but don’t be put off if a few don’t work out, go with an adventurous mind, we can have just as much fun as the next guy, and at least we have somewhere to sit.