Long story short, his front wheels were hanging 5 foot above the road below. We told him we'd give it a try but wouldn't be liable for any damage! He said go for it.... so we pulled him back until the front wheels were hooked on the ledge... then we started pulling the top of the wall apart . The wheels were over 50% below so obviously it wouldn't roll.
Then the farmer next door got his tractor and managed to get the very edge of his bucket under the front tyres enough to lift it a few inches so I could pull him back over the top of the wall.
45 minutes after arriving at the scene, 15 blokes, 50 opinions and a free pint of Thatchers later it was back on the car park.
Poor bloke... Most expensive Sunday pub lunch ever!