Thanks Black Rat, that makes me feel a whole lot better!! lol. After considering all comments, I have decided to go for it with Meteor which looks reputable (who knows??)
I intend to ask the pick up driver to sign a mileage verification and car condition note, and I will leave the fuel tank nearly empty. Token efforts I know, but I will also threaten the driver with the wrath of MOH if they so much as put a smudge on my brand new Merc! That ought to really scare 'em.
Taxi not really an option, £200 plus, and it's too far to Gatwick to expect a lift. Meteor's special offer means it is only costing me £20 more for the meet and greet than for long term parking.
Has anyone ever considered a recipricol airport transfer facility among Forum members??