He is the most ruthless person I’ve ever met or probably will ever meet. I mean utterly, utterly, utterly ruthless. Very secretive as well, doesn’t like any sort of compartment of his life being looked at by another compartment of his life. And not a team player. I’m very much a team player, I love being part of a team, I think that was what it was all about, was basically he didn’t want to play in the same team as not just me but anybody, he does this kind of stuff to other people too.
26 January 2022 – Sonia Purnell, Johnson’s biographer and his former deputy in the Daily Telegraph’s Brussels bureau