Not only are some of the 'direct' civvies cutting the corner to Newcastle singularly uncooperative, they won't even adjust their vertical profiles if it will cost them the odd kg of fuel.....
I recall doing a receiver training sortie over the North Sea. My student was wrestling with the VC10 whilst attempting to prod another when we were asked 'for co-ordination' would we please turn as a civilian aircraft under RAS wanted a direct to Newcastle. "Negative, we will continue under VFR in Class G airspace, advise the off-route civilian ac of our intentions", I told the air trafficker, "Vector him around us....!!"
It turned out to be some Fokker 50 or similar trying to save the odd few pennies by flying off-airways. If they want to do so, they should expect extensive vectoring. If they don't like it, they should stick to the damn airway structure!