(And yes, the title is meant to be ironic).

Via the BBC:  Cannabis farms: 21 found each day, police chiefs say

An average of more than 21 cannabis factories were found daily in Britain last year, police chiefs say.

[…]

The number of farms discovered increased to 7,865, more than doubling in four years.

[…]

It estimates that the number of recorded cannabis production offences in the period from April 2011 to March 2012 will rise to 16,464, up from 14,982 in 2010-11.

In the last two years, police forces have seized 1.1 million cannabis plants.

Whatever else this means, it certainly seems to underscore that interdiction isn’t working too well.