Former Labour prime minister Tony Blair made an early intervention in British politics on Sunday after Keir Starmer’s landslide election victory, urging him to have a “plan to control immigration”. Blair warned Starmer, who will visit Scotland on his second full day as prime minister, that the anti-immigration Reform UK Party also posed a challenge to Labour, not just the Conservative Party. The Reform UK party, led by Brexit firebrand Nigel Farage, maximised the damage to the Conservatives at the election by splitting the right-wing vote. It won five seats in the Westminster parliament and 14…