...as the place we had booked (Love Lane Car Park via Your Parking Space - have used it several times before) was full and clearly overbooked by the time we got there so we had to park over the road and pay £10.

I've got the same place booked for the Spurs game, so I'm probably going to look at other options - might look at the legit car parks in town and getting the shuttle bus as that worked fine for Mansfield. More expensive, and a bit more effort but I prefer "reliable and stress-free" over everything else personally!

I'd say that your best bet is to look on JustPark or MyParkingSpace for people's drives - I use them for gigs all the time and they tend to be more reliable/legit than the big "open wasteground" car parks like Love Lane.