"On 1 June 2017 the European Parliament voted to adopt a resolution calling on member states and their institutions to adopt and apply the International Holocaust Remembrance Alliance working definition of antisemitism.

24 of the IHRA's 31 Member Countries are members of the European Union. Austria, Romania and the United Kingdom have already formally adopted the working definition.

The European Parliament resolution passed on Thursday(01/06/17) calls on member states to protect their Jewish citizens and Jewish institutions from hate crime and hate speech, to support law enforcement efforts to identify and prosecute antisemitic attacks, to appoint national coordinators on combating antisemitism, systematically and publicly condemn antisemitic statements, to promote education about the Holocaust in schools, and to review schoolbooks regarding content related to Jewish history and contemporary Jewish life."

You may wish to split hairs and argue over the semantics of the resolution but 24 EU countries are members of IHRA. How long do you think they would have tolerated Labour dissenting. As a puny ineffective opposition party their dissent could perhaps be ignored, BUT any sniff of becoming the ruling party would focus attention on this dissent and it would become a major international issue.Especially as the ruling party has already signed up to the resolution. I have no need to check the facts, Realpolitik would dictate the outcome, as you very well know.