Jim,
No antisemitism has been "identified" in the Labour party - it has been alluded to

We have the statements of Livingstone, Shah and Wallace.
None were about Israel.

"Again, no-one here would disagree that point, so why make it?"
Because it is the crux of this argument
Will is quite right.

It is not "the crux of the argument" because no-one is arguing against it.
Of course Will is right, as is McGrath.
It is not antisemitic to criticise Israel, and no-one says it is.

The Israelis have described all questioning of its political policies in regard to expansionism and Gaza as Antsemitism

No they have not. If you have not just made that up, show us a quote.

Will,
I can equally criticise the government of Israel, should I feel so inclined - and this equally does not make me anti-semitic per se.

Of course not Will, but no-one is saying it does so what is your point?