Who are these redwallers leading the charge? Per The Times, it's er, the MP for Rutland and Melton (Alicia Kearns), West Dorset (Chris Loder), and Birmingham Northfield (Gary Sambrook?). Ok, I'll give you the last one, but not the first two. Looks more like it's new MPs more generally who are meeting.
Here's Nadine, saying pretty much what the anonymous source said earlier, by a huge coincidence. She's added in that the MPs are being "disloyal to the country". I'd use that one if I were Starmer. Plus Ghana.