London is cheaper and warmer, at least compared with Davos, says London Mayor Boris Johnson.

"The fall in the pound is of huge value to London's exports and all sterling-denominated assets. We're seeing a very impressive effect here. We take advantage of the upside and the upside is that the pound is competitive," Johnson told Reuters.

"And everybody in Davos, once they finish this massive negotiation of egos, this complete vanity, should come to London. It's considerably cheaper and considerably warmer."