If you were going to drive it 5000 miles a year, it would be better to buy a 2 year old MG with 45,000 miles or less. Then it will still be covered by the MG warranty until its 7 years old.£14911 would be a steal, and for someone doing low mileage the fact it's done 80k is immaterial. It will likely take ten years to add another 50k!
The best bit about buying a second hand EV is there aren't going to be all the usual fears about something big about to go wrong that has been unseen or covered up by the seller.
The MG warranty has a mileage limit of 80,000 miles with various lower limits for wear and tear items.