In 2005 the Labour govt made psilocybin mushrooms illegal.
One mushroom (fly agaric) which can produce the same effects as magic mushrooms remained legal. The fly agar mushroom contains a powerful toxin which is very dangerous if the mushrooms have not been properly prepared.
Magic mushrooms are safe and no deaths have occured due to magic mushroom consumption.
When the were still legal LSD uses decreased.
In addition scientists have found that psilocybin (the active compound in magic mushrooms) have medicinal uses. Magic mushrooms can be used as treatment for depression, anxiety and drug dependence.
There is no reason for these mushrooms to be illegal!