The legalisation of all recreational drugs.
Why does this idea matter?
Let's stop wasting so much time and money fighting the 'war on drugs' that will never be won.
Legalise them all, control them and tax them. Bring the £billions into the public coffers rather than the organised criminals and use some of the money raised to help those with drug problems.
By legalising you would also reduce the number of convictions and prision sentences and potentially also drug related crime.