Has anyone been stopped with them in hand luggage?
Yes, flying out to the alps in the mid noughts using my riding pack as hand luggage. Thought I’d cleared out all offending items pre-travel, but the pack I was using at the time was a cavernous thing with a labyrinth of pockets. Got pulled up for having three “jelly like substances contained in metallic foil tubes” and a CO2 canister. I can see that I didn’t help my cause when asked what the canister was calling it a ‘gas bomb’ without thinking, after that my efforts to de-escalate the situation by offering to eat the gels in front of the increasingly suspicious security officer to prove they weren’t cemtex fell on deaf ears. Confiscated and a stern talking to only, although I suspect these days / had I not been a pasty Welshman the out come would be very different