Given the current economic conditions, the Government is keen to encourage all sort of new entrepreneurial initiatives. But the growth of Britain's private cannabis farms is probably not quite what the Treasury had in mind. A clandestine industry has sprung up in the bedrooms, living rooms, cellars and roof tops of Britain. Some do it for personal consumption, others grow cannabis for organised criminal networks who make millions out of what they know is a comparatively low risk, high-profit crime.