The world of adult colouring books has come a long way since Johanna Basford kicked off the trend with 'Secret Garden' back in 2012.
Last year, more than three million adult colouring books were sold in the UK and the books could soon be subject to VAT.
Funnily enough, it's not just the relaxing impact of floral patterns keeping us all so occupied.
From pages filled with swear words to books designed to make you giggle when you're drunk, here are our favourite colouring books that are definitely designed for adults.
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