By Christian May Warming up for the Budget in the Commons yesterday, Rishi Sunak and Keir Starmer engaged in a civilised, warm exchange in honour of the former’s final outing as Leader of the Opposition. They joked about cricket, Yorkshire and life as a constituency MP. Within a couple of hours, Sunak was back on his feet delivering one of his strongest Parliamentary performances, lambasting the Labour government for unveiling an eye-watering array of tax rises that far exceed anything they set out in their manifesto. Sunak spoke for many. Before the election, Starmer said “our plans do not in…