I was just about to mention a mobility scooter but Joe beat me to it!!
2 things regarding either wheel chair or scooter Mike as I have both.
Firstly, wheelchairs a OK but you have to either operate it yourself or be pushed around, that is OK if you are on the flat but uneven pavements will cause problems as if the pavement tilts downwards towards the road then you have to use extra muscles to keep one side going straight and I can tell you from experience for those aged 65 plus, it takes a lot of effort, even for some-one who is pushing you depending on the carriers weight. I use mine when going to garden centre or supermarket as it is easy for me to use in those establishments but anywhere else, muscle power, especially going up slight slopes.
Secondly, if looking towards a Motability Scooter to use and or hire, go for one that has Lithium Battery and can be easily taken apart to put in boot of car. I have one and use it when having to travel further around town or even go to the doctors, mine is for pavement use only, it is easy to assemble and can travel up to 30 miles on one charge but depends on temperature. It will travel up to 4 mph which is plenty fast enough but not always possible due to uneven surfaces and pedestrians. I am sure that you would be able to hire one and if you do then when you park up and go for refreshment make sure you do not leave anything in the basket or leave keys in ignition!!
Be sure to ask what the range of the scooter is as some have only around 9 - 13 miles, you will use more power from the battery by stopping and moving, I would ask to hire a pavement scooter that will have a range of at least 13 miles even though you will not travel that distance and one final point, large scooters usually have pneumatic tyres i.e. air in 'em, just make sure if you want one that if you have a break down cover just in case of a puncture and need some-one to come out for recovery but again, disability shops usually provide this service.
Regards
Nigel.
I used to be an optimist but with age I am now a grumpy old pessimist.