Mr Barrow, 59, who has led Westminster council for four years, told stunned Cabinet colleagues of his decision on Friday evening. They were sworn to secrecy until a formal announcement was made on Saturday. He insisted the departure was for personal reasons unrelated to the furore over parking and wanted to "change gear". However, senior Tory sources he had been left with no option but to quit after realising he had become hopelessly isolated within Westminster's ruling Tory group. "He didn't have his ducks in a row and he had no supporters," a source said.