Until around a year ago, I was in regular contact with someone who worked airside at EDI, responsible for operations.
His words to me may be paraphrased as 'We always keep a JCB on standby, for the event that a GA aircraft blocks our main runway. The cost of replacing a light single is cheaper than any penalties we have to pay for delay to commercial scheduled flights'.
Basically, the attitude was that any emergency for resulting in a blocked runway for which clearance would impede scheduled operations - bye bye GA aircraft! I didn't enter into the argument about preservation of evidence for AAIB, etc as the guy had a total down on GA ops at EDI!