What class of scooter do you have? If it is categorized as a class 3 invalid carriage, you will need to ensure it is registered with the DVLA as well as choosing an insurance policy to cover you against breakdowns and damage.
While it’s not a legal requirement to take out insurance for your mobility scooter, it is certainly wise to do so.
Having mobility insurance for your scooter or powerchair will cover you against accidents both to your scooter and for any other property or people.