I had the misfortune of working for at DHL once when it was freezing cold only choice available was sitting in noisy puddle jumper with engine running or in a heated portacabin with a television, only to be told by some jobsworth that it was for staff only… needlessly to say after a couple of arguments when I refused to either leave the hut or turn the engine off (not sure which now) I was escorted of site by a nice security guard… I guess they only needed a driver for half a day…