‘Christ, I would be shot for buying this if people knew,’ says an anonymous fan in the comments below Amazon’s unlikely bestseller Enemy of the State. Which sums up how I feel before meeting the book’s author, Tommy Robinson. What if he turns out to be not nearly as bad as his reputation as ‘Britain’s most hated man’? What if, as some familiar with him have warned, I turn out to like him and want to plead his cause, and end up being tainted as a far-right thug by association?

We meet in a gastropub in a pretty Georgian market town....