Who will fill the vacuum in No. 10?

<div>Five members of Boris Johnson's team have now resigned from No. 10. This led Downing Street to bring forward changes to Johnson's top team – announcing the resignations of chief of staff Dan Rosenfield, director of communications Jack Doyle and Martin Reynolds, his principal private secretary (who sent the now notorious BYOB email). How will the PM fill the vacuum they leave in No. 10? Katy Balls speaks to Fraser Nelson and James Forsyth.</div>