A Green council candidate arrested this week over alleged antisemitic social media posts has been seen canvassing subsequently alongside other party members, prompting Labour to say it showed the issue was not being taken seriously by Zack Polanski’s party. Sabine Mairey was one of two Green candidates in Lambeth, south London, arrested by the Metropolitan police on Thursday morning. While the Greens declined to comment because of the police inquiry, it is understood that Mairey is being investigated by party officials and is likely to be suspended in the coming days, and that the other candidate, Saiqa Ali, has been suspended. Saiqa Ali has been suspended by the party. While Green party rules say candidates under suspension or investigation should not campaign, Mairey was pictured on Sunday campaigning in Clapham, where she is standing, with a group of other party activists. It is understood that this was not known about by the central party, and that Mairey will be contacted to be reminded of the rules.…