In noting this niche, Glass and Shirwan aren’t alone. Across the city, in pubs and galleries, bars and clubs, on roof terraces and in public halls, Londoners are flocking to evenings of intellectual stimulation. Like First Edition, Salon London offers nights dedicated to the discussion of ideas. ‘The concept came out of the clubbing model of the 1990s,’ says co-founder Helen Bagnall, a 43-year-old writer who runs the group with musician Juliet Russell, 47, and web architect Diccon Towns, 45, ‘that feeling that you very much enjoy going out and having unexpected experiences, but as you get older and work gets harder, you don’t want all your social life to revolve around boozing.’ What began as a gathering of 40 acquaintances in a Westbourne Grove church hall six years ago has become something bigger. There are monthly events at bookshops and bars, with three speakers at each. Recent nights have seen the technology writer Ben Hammersley discuss brain optimisation, and author Olivia Laing on the relationship between creativity and alcohol.