Parked up yesterday and was horrified to find that Bob the builder had been there and left loads of nails and screws on the ground. Visited my local tyre centre this morning for a check over and was told that every wheel was six pounds under pressure. I told the fitter that last weekend I had visited the garage and as always all four tyres were within a pound of the correct pressure. He told me that garage air centres were notoriously inaccurate. Has anybody else found the same?