He told delegates: “I think craft beer has gone mainstream this year because of the number of bars stocking it, the number of craft-beer bars opening, the number of my friends talking about it, and the amount of press coverage it is getting.
"I am being contacted by pretty much every single multinational brewer or one of their marketing agencies to talk about whether a main brewer can brew a craft beer."
He also dismissed claims that the craft-beer movement started in London.
“Craft beer and craft-beer bars started outside London. Of course within a couple of years London suddenly felt it invented it, as nothing happens outside London. It is a universal concept and it has gone mainstream.”
He said this is evidenced in the growth of craft-beer festivals not run by the Campaign for Real Ale, the amount of craft beer on supermarket shelves and growth of brands such as BrewDog which have mainstream distribution and are turning into a global brand.
He admitted it was impossible to define craft beer but said: “Most of us know what is a craft beer and what isn’t.”