Thanks for sharing this Tom - the full article by Stephen Marks. It is a pretty aggressive response and also prejudicial to any claim he is sufficiently open minded and sensitive to handle complaints of antisemitism (labourbriefing.squarespace.com/home/2018/5/25…)
A few choice quotes from the person who may be sitting on Labour's committee dealing with antisemitism 
The real point here - and it goes back to McDonnell endorsing Jenny Manson, is that JVL should not be let anywhere near issues around antisemitism. They basically approach the entire issue as if it was a gigantic smear. They are part of the problem.
Letting JVL, an organisation which essentially denies the seriousness of antisemitism in the Labour Party, sit on a committee dealing with antisemitism is, and I am going to use the term which people keep using to me, gaslighting.
