Dave,
why are people saying it is rampant within the Labour party I wonder?

No-one is or has said that Dave.

Naz Shah is not of the far left

So what?

and that seems to be the only example that can be verified

Others are referred to in those Guardian links I gave yesterday.
Then there are Livingstone's.
Also Marc Wadsworth.

and even that is disputed

Disputed by who Dave? Just you three I think.
Can you quote anyone else disputing it.