London | Boris Johnson's barnstorming tilt towards Britain's prime ministership will make or break plenty of Westminster political careers. But there's one well-established  player who has plenty riding on this juggernaut: Australia's very own Lynton Crosby.

With his company C|T Group fresh from claiming a share of the glory in Prime Minister Scott Morrison's come-from-behind victory last month, Crosby is riding high Down Under. In Britain, though, his high-profile turn as a Conservative svengali has been more of a rollercoaster.