What are you talking about?Starmer has a problem the will start to appear within the next six months, the absolute large majority will cause the far left to put pressure on Labour to legislate far left laws. You can bet that the far left is a huge bloc. It won't be a good look when Starmer is pushing back against this group.
There is no massive Far Left Bloc in Britain, never has been.
The new Labour Govt's biggest concerns in the short term will be giving Brits some hope around their everyday standard of living, addressing immigration (already ditched the farcical Rawanda scheme and planning a better Border Force) and standing up to attacks from the Far Right who claim to be the authentic Voice of the People (with 14% of the vote)