Locating a seriously short-of-fuel Cessna near Berwick-upon-Tweed, lost en route from Cumbernauld to Carlisle in foul weather and gathering darkness, and leading him southbound at very low level towards Brunton, then a tense R/T message "Engine's quit, going for the beach" followed by the relief as he executed a good forced landing near Holy Island and the two of them climbed out onto the mud, boots and underwear soiled in equal measure...
Launching on a first light search in the Highlands, perfectly still morning, not a ripple on the lochs until the downwash created a wake across the water.
Role demo on Lake Windermere, beautiful summer's day in 2002, thousands of people watching on shore and on countless boats, running in at 50' to put smoke on the survivor, dodging the masts of numerous boats which had strayed into the supposedly sterile area, then a series of wingovers in front of the adoring crowds while the winchman was busy on the IRB. Or another role demo at Queensferry which involved searching for then rescuing a bendy diver...well there had to be some reason for flying repeatedly under both Forth Bridges...
Racing the express trains on the main line north of Boulmer, lots of waving and smiling faces from the children in cattle class but not so many from the posh people in first class (won't mention the times when a slight headwind meant that Westland's finest couldn't keep up with the train).