Not sure about doing something just at the conclusion, but I believe the Coldstream ran their own version of EX Long Reach for the battalion a while ago. The YOs expected to man the checkpoints, but right at the start line the CO said "take off your uniforms, put on these great coats, you have five minutes to memorize your route". Soldiers were told they'd get extra points if they captured a YO. That part of the exercise was known as Ex Running Rupert.