Inverness use arc procedures all the time. However due to wake turbulence and IFR separation they can only give out the procedure to 1 ac at a time and then must wait 7mins before they can give it out again, unless they are visual with the first ac. When it gets busy, the first ac is given the arc the remainder are given overhead procedures holding at the beacon at safe levels until the first ac is down. This slows everything up to a snails pace. Equally due to high terrain in the area the procedure for CAT C ac is flown at 14dme turning inbound on the approach radial and then descending at the FAF, at about 11nm. In good weather Inverness, invariably give an overhead procedure hoping the ac will become visual. In marginal weather, most of the pilots on the arc cut the corners in an attempt to become visual. Only in poor weather do they ever stick to the procedures like glue.