Completely meaningless - probably all the Tories who have ambitions for the top job, to demonstrate their credentials to the party membership.
No it's not meaningless - the Hansard chap on BBC Parliament just said it could mean two things but I'm afraid I've forgotten what he said.
Edit: The gist of one of them was more Tories are still pissed off with May than expected.
@Fox started
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Completely meaningless - probably all the Tories who have ambitions for the top job, to demonstrate their credentials to the party membership.