I was living in London when somebody found a loophole in the law a couple years back. Apparently it was legal to sell fresh shrooms. Only dried shrooms were illegal.
Suddenly there were about 10 shops in Camden selling fresh mushrooms.
I would buy a tub and eat them on the tube while going home.
but this only lasted about 2 months or so. There were lots of smiley peeps walking around london during that time.

Anyone else in London over that time?