I think its just a statuatory call out charge. But to be honest, it would probably be around the same price to call someone out anyway.
And the police got them there in less than 20 mins, so i guess it was worth the extra monies haha. Usual wait is well over an hour.
But to put things on a better note, the car is fixed, had to get a new wheel, its painted, fitted, everything superly tightened and the aero is back on the road it all in sexy glory
Now sporting an RPM orange roll cage too! Will stick up some photos later once i get a minute haha.