As far as I am aware the ac variant was an F3, from 56 Sqn at RAF Leuchars. They were supposedly under the control of FC at the time, but as the F3 was low level, they were not painting on any radar that the FC had access too, nor was the helo. The first that the FC knew about it was when the F3 climbed and had also appeared to **** himself. Apparently the ac tapes indicate less that 60ft sep. The pilot RTB'd immediately as he had maxed the airframe in avoiding the helo.
Due to the trg requirements of 56 Sqn they need to operate at low level on occassions and unfortunately due to fuel constraints need to operate in that area. Ideally, they would operate to the south of the HMRs but this is not practical.
I agree that this was a serious incident, and that they only way to avoid it in the future would be to establish a helicopter corridor around the HMRs. At the mo with it being Class G, it is everyman for himself. Keep a good look out for arrows of death.