In the heyday of the IRA the major UK airports embarked on a panic exercise to hire a swath of security people. Initially limited to Heathrow, Gatwick and i believe Glasgow, this brown army suddenly descended, subjecting all and sundry to security checks. Fortunately they still allowed crews to go through their briefing procedures and jump in a minibus to get to the aircraft, without the utterly pointless step of going through the pleb security!
One trip saw us near the holding point of 10R at Heathrow ready for a quick trip to Glasgow, when the hostie came onto the flight deck (we knew it as the cockpit in those non-pc days) and said we had a pax on board who was actually going to Edinburgh. Being somewhat gallant I ignored that the hosties must have been less than diligent in their check of the boarding passes, after all in those days getting the lippie and stocking seams right was more important. However, the punter had also gone through four 'brown army' checks and still come down the wrong pier!