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Purple Parking. I've used them a few times including for 3 weeks in Oz last year. 3rd week is free, only 5 mins drive from terminal in courtesy minibus. They are one junction closer to London off the M4 than the airport.
Whilst we're on the subject, what's the best place to park if I'm flying from Edinburgh to London. The car has to stay for 4 nights, so it must be secure.