Up at Spadeadam we done some 'They were here but they were not here' work with the Sky Shadow (think that what was it was called) pod and 617 I recall.
What felt like hours of a Tornado calling Music On/Off and us marking the calls on a paper plot.
The rumour was that the Red Menace had a trawler sat on the Solway Firth not doing much fishing.
Anyone remember some Intelligence pamplet doing the rounds called 'The Threat', at least I think it was called that.