So apparently leaked files to Al Jazeera have resulted in them creating a 3 parter on the topic. Some juicy stuff in here, some of it summarised here: https://electronicintifada.net/blogs/asa-winstanley/new-bombshell-film-exposes-israel-lobby-role-uk-labour-party
Very credible network, regarded as in the mainstream, and even liked by many libs because the English side of the network has many former BBC broadcasters.