Read our Privacy noticeThe UK’s leading polling expert has warned Labour not to make the same “mistake” as the Conservatives and focus too heavily on immigration. Sir John Curtice cautioned against focusing too much on an issue over which ministers did not have complete control until the world becomes a safe place. It came as Rachel Reeves defended Sir Keir Starmer’s attack on Reform UK’s plans to remove indefinite leave to remain for non-EU migrants already living in Britain as “racist”. Focusing on Reform UK would also be a “mistake” for Labour as the party is also losing support to the Liberal Democrats and Greens, he said. Sir John said: “It is a mistake to believe that this party’s only problem is Reform.