Here is the Wiki on Neil McEvoy. Its hard to tell what is true when they write about non-communist politicians, or more accurately, communist non-compliant politicians, but what we can tell is he is not left wing. He is the one who was visited in this video by the Jacobins.
Mark Drakeford I believe is this guy. A Labour Party politician. The one who was able to deliver his leaflets for an election with no interference from the police.
The UK Labour Party is pretty much Marxist-Leninist at this point and deeply intertwined with the Fabian Society.