Found this R&J Q&A after a quick google. They have changed their tune a bit in 3 years...

phillip : what does richard and judy think about the down grading of cannabis, from a class B drug to a class C drug , and what affect do they think it will have on society

Judy : My personal feeling is that legalising drugs is in fact the only way to combat the horrific crime element which is without doubt the worst aspect of illegal drugs in this country. I think it's hopeless to try and convince a lot of young people that they shouldn't smoke cannabis, as it's already a large part of their lifestyle. But I do think that not everybody should smoke it - we have heard of many reports of psychosis in kids who use it regularly.

Richard : I agree with Judy. You'll never get the government of the day to decriminalise drug use. We have met senior politicians who privately agree that it would reduce street crime and robberies at a stroke - but the political cost is just unthinkable. If it were down to us we would have a joint programme of decriminalisation that would totally stuff the dealers and also introduce a massive public education.