uktigger,
we get a one night plus parking deal. Last October that was at the holiday in express (about 10 mins from the aiport). I night with breakfast and 8 days at the "summer special" parking for 4 of us was £60. It isn't worth the hassle of catching the train for that! We use holiday extras to book the digs etc. and have always found them good. We'll be going through the same routine for our trip in February