I previously worked at BFS in operations - and used to watch with amazement as the Post Office vans sped around the ramp on the night shift.
One particular night we challenged one of the drivers as his driving and lack of attention was causing concern - he replied that he thought the airport wasn't as busy at night so the speed restrictions weren't in force!!
Upon checking his training records he was found to have had 2 hours of airside driving training 3 years ago !