Despite becoming chancellor on Tuesday, Zahawi is behind the scenes preparing a Crosby-endorsed plan to become prime minister, which includes cutting corporation tax and VAT and a review of stamp duty. He appears ready to kick-start the campaign immediately and the team was preparing a confidence-focused resignation letter if he had not become chancellor. Sir Lynton Crosby helped Boris Johnson become Mayor of London twice ALAN DAVIDSON/REX FEATURES Behind the leadership maneuvers are strategists close to Crosby, the Australian election guru who helped Boris Johnson become mayor of London twice and ran David Cameron’s 2015 campaign. Mark Fullbrook, founding partner of Crosby’s CT Group who worked at Johnson’s