Steve,
I have yet to read, among all the verbiage you go to so much trouble to reproduce, of anyone in the Labour Party saying the magic words "Ken is an antisemite."

Of course you have.
Labour MP John Mann.
Mann told Livingstone, "you are a lying racist"
Asked if he thought Livingstone was anti-Semitic, Mann said, "Yes he is."
http://www.huffingtonpost.co.uk/entry/ken-livingstone-suspended-from-labour-party-for-antisemitism-and-hitler-comments_uk_5721fbd9e4b0a1e971cb2513