I still don't understand why people put up with it. If I was on a plane, on the ground, for more than a couple of hours without being fed, watered and entertained then I would just walk off it. If I had to I would blow the slides to get off.
Yes, they'll probably arrest me but nothing will come from that in the UK. And I'm sure large numbers of people would follow so it is unlikely that they would even arrest.
Don't put it up with it and it will stop happening!