LONDON, June 10 -- When the American right's traveling conference announced its British franchise in March, with Liz Truss as its face, Nigel Farage's party had two words for it: well clear. That is where Reform UK would be steering, a spokesman said, and the snub was understood across Westminster for what it was, the leader of Britain's insurgent right declining to share a stage with its most radioactive failure.

Three months later, the steering wheel has turned. I look forward to making a keynote speech at CPAC Great Britain later in the summer, Farage announced over the weekend, confirming he will headline the event he refused, a reversal first reported in detail by the Guardian and one the conference's organizers wasted no time adver...