If working people are the major raison d'etre of the British Labor Party, then working people and their interests should be the major topic of discussion when discussing labor issues.
It seems to me that people should be pressing for a future strategy to implement popular Corbyn policies. If the other side says "That's just changing the subject" then ... Double-down. Triple-down. Quadruple-down: Its **not** changing the subject, be vociferous. Party conference is still 9 months away.