Ring them up Achybones the market themselves may have a scheme where they hire wheelchairs. Due to the crowds there I don't know if a scooter would be a good idea? Especially if it's really busy. You may get away with a mini one, the sort you can pack in car boot or find somewhere the hires out Luggies. I know I can't stroll around the market as I used to and no seats are inside as such.