Anyone got any opinions on where to park or not to park?

Been looking at a few options and:

Official LGW parking: £24 for the 2 days I need at a car park 5 mins away by shuttle bus.
As above but through the BA website, £24 + 120 Avios.

Holiday Inn: £78 for a standard room + up to 8 days on site parking.
As above but through the BA website, £62 with up to 4 days parking.
Any Priority Club points, stay credit, Avios etc here?

Can get the Premier Inn for £44 + parking costs and it's right across from the north terminal so no shuttle bus required to and from the hotel (technically the same price as the HI with the £3 e/w shuttle bus).

£21 for the possibly suspect Travelodge + £7.50 a day on site parking

£34 to park in the car park next to the north terminal.

Few other hotel options although a lot of them want your car keys and not keen on someone driving my car with the possibility that something happens to it and the t&cs say "tough".