Kelly1379..Thanks for the post. Just quoted me £80 for meet and greet using the same dates I have just paid £133 for.
My only concern was their T&Cs around insurance whilst parked. I would have no problem with this if I had parked the car myself but if they do so and then reserve the right to move it as required then I fear that any dents or scratches could lead to an extracted fight with insurers. None the less they do appear to be offering a very competitive service.