While Mountain Flying was a distinct separate skill in helo training, I don't recall any such distinction made in respect of call-outs. As a 22 Flight at Valley, we had an obvious mix of operations as did the northern 202 Flights. but the most 'mountainous' job we had at Thorney was climbers falling off the Needles ! Possibly arguable that our Sycamore operations in Aden in the mid 50s covered the areas up to Mukheiras (6000') and similar.