It's not an easy place to find so you would be wise to save this picture giving directions. I hope it is still readable after this upload.
Basically, Meatons (i'm not sure of spelling) are the agents and their work is done by A & P Services who are located on Sandown Race course.
The map I got from the Parking guy there. Follow the red line and then the biro line I've drawn on.
Paul ( the P of A & P) was very helpful and wouldn't take anything after locating my oil leak. It's small but annoying but not worth a major strip down just yet. Don't hesitate to contact them via Hatz. They had some Eco bikes in the other week as well.
