Two years ago she delivered her standup routine to 10 people in a strip club. Now she’s a star of the Edinburgh Fringe and touring the country. She talks biros, big families and why the new pope is ‘bloody marvellous’, writes Mark Lawson
Sarah Whitehead: Marijuana legislation is being relaxed all over the world – but not in the UK, where the most unlikely of horticulturalists are taking the law into their own hands