It seems that the metal detectors have been made a lot more sensitive, or else there is a plot afoot to try to ensure you miss your flight. On a recent trip through Manchester airport, despite removing everything and turning my kilt through 90º, I was still stopped. After the physical search, the wand even picked up my garter buckles, which I was told I would have to remove , although I was eventually allowed through without doing so, but my shoes, ordinary brogues, were put to the back of the metal detector conveyor queue. Combined with over an hour in the check in queue we had to run for the plane. My daughter on a different security queue fared no better without a kilt, they found different excuses to delay her.
On the way back through Grenoble airport, my sporran was removed from the Metal detector conveyor and "lost" for some time.