We’re currently looking at getting a Mini, this exact model in fact. As said, Mota seems pretty good value to me… https://www.selectcarleasing.co.uk/car-leasing/mini/hatchback/hatchback/20-cooper-s-classic-premium-plus-5dr-auto?mileage=20000&term=36&initial_payment=9
If your only option is to lease, then Motability always wins as they get 100% VAT exemption. Most of those who leave Motability buy privately, either new or second hand, rather than lease. I appreciate that not everyone has the means to do that but, for those that do, it can work out a lot cheaper, especially for the lower end cars. I bought one of my daughters a brand new Hyundai i20. The total running costs over the 5 years that she had it (including depreciation, servicing, insurance, breakdown cover, tyres etc) was one third of the cost that it would have been to have had the same car for the same period through Motability.