Swiss Foreign Minister Micheline Calmy-Rey

Friday's event will feature guests including former Swiss President Micheline Calmy-Rey and Rudolf Dietrich, director general of the Swiss Customs Union, and Mr Whitman suggested Mr Davis would be likewise keen to talk to Swiss diplomats and officials about how a country can profit outside the EU.

Catalan's fugitive ex-president Carles Puigdemont, right, takes part in a panel titled "Self-Determination", with former Swiss Federal President Micheline Calmy-Rey, left, and moderator, journalist Darius Rochebin, background center, at the FIFDH (International Film Festival and Forum on Human Rights), ...