Boris Johnson has officially become Prime Minister – so what can we expect from his first 100 days (00:25)? And with the Gulf situation hotting up, what should Britain’s policy towards Iran be (11:25)? And last, we hear from a historian who kayaked the length of the UK and Ireland within a year (25:20).

With James Forsyth, Simon Hart MP, Con Coughlin, Lina Khatib, and Dr David Gange.

Presented by Isabel Hardman.

Produced by Cindy Yu and Matt Lee.