The air control orders (ACOs) for RAF helicopters in (West) Germany back in those Cold War days usually stated not above 150 feet agl. That was the whole of the country. Fixed wing had to be not below 250 feet, to give a 100 foot separation. In published low flying areas, or areas designated as exercise areas, or areas which crews were deemed to have become familiarised with, we could transit at 50 feet agl. For certain parts of a flight there was no height limit, only a ten metre MSC, minimum (lateral) separation clearance. We regularly trained to fly under wires. Minimum clearances for that were 6 metres above, 3 metres laterally from a pylon, 2 metres below (to avoid the possibility of HT arcing through the airframe).
It was quite normal to get “bounced” by fast jets looking for training targets to play with. F-104s and F-4s were relatively easy to deal with, you could spot them miles away by their trail of black exhaust smoke and even if they saw you they were in the next county by the time they had turned round to get a bead on you. G-91s were more difficult to see, difficult to lose and flown by mad Belgians! Harrier pilots usually had to be told where we were....
Glad to have been part of it, but I wouldn’t want my kids doing it!