You can check Turo, previously known easycarclub. You rent a car from someone basically, all insurance etc. Most of them have 200 miles limit but if you look around, some have unlimited or you pay extra. https://turo.com/c/andriuss22 referral should give £25 off on the first booking. I got away using WV Polo for one day, done 200 miles trip, £22 car + £24 fuel with first booking discount, as long as you are happy to get a car from somewhere further (I cycled and then loaded the bike and made my journey where needed).