Gatwick long-term parking is not expensive if you book in advance. You need to take a slow bus shuttle to the terminal, but it's never more than 15-20 min including waiting time. I've used it a zillion times as I'd rather not give my keys to those meet & greet companies who drive your car 5 miles. It might void insurance and waiting times when you return tend to be over an hour.

I'd rather not give my keys to those meet & greet companies who thrash your car for you while you are on holiday.

https://news.sky.com/story/i-paid-numerous-fines-after-leavi...