Another thing to be aware of when hiring a car is that they don't always charge you for weekend days. Also consider pick up times and drop off times.That got me curious so have had a look.
I can hire a car for the month of Jan for £500. Can also get a day rate of£82 in Jan.
The average cost of owning a car (everything included) in UK is, apparently, £3500
When I was hiring for a weekend I would pick up at 13:00 on a Friday and drop off at 12:00 on a Monday and this was equivalent of one day hire as they charged based on working days. I only realised this because I once missed the drop off time by a couple of hours and I had to pay one extra day hire which doubled the cost of the hire. They explained this when I queried it.
So hiring over a weekend is a lot cheaper than hiring during the week. Or at least this was the way Enterprise charged their hires circa 2018