When younger members of the UK’s royal family are pictured emerging from a nightclub in the early hours of the morning, there is a fair chance they will be tumbling out of Boujis in London’s South Kensington.

Now Matt Hermer, the man behind the favourite late-night watering hole of princes William and Harry, is planning to open his first venture outside the UK: a bar on the 26th floor of the new W hotel in Barcelona.