Very naughty. As naughty as it gets. They grow are available in a field near you, starting round July/August as the weather gets cooler and damper. You should google as much as possible on psilocybe semilanceata. Although there aren't any deadly lookalikes, it's nice to know the thing you're eating is actually going to make you trip and give you as little stomach upsets as possible. And it's good practise for any other countries where a little mistake can result in your death.
Yes from England too, and i pick and store Liberty caps every season, occasionally fly agarick's aswell. But mainly stick to the libs though, very recognisable to find and collect etc, and after finding a good site over 10 yrs ago ive returned back there every year since to harvest. And like said do some research on the net and books etc before going out picking, or you could make yourself realy ill or worse. any questions dont hesitate to ask, stay safe .. And have fun !