Rishi Sunak has sacked the Conservative party chair, Nadhim Zahawi, after he was found to have breached the ministerial code by failing to declare the HMRC investigation into his tax affairs. An investigation by the prime minister’s ethics adviser, Sir Laurie Magnus, concluded that Zahawi had committed a “serious breach” of the code by not telling officials he was under investigation by the tax body when he was appointed chancellor by Boris Johnson. Here are the letters between the prime minister, his ethics adviser and Zahawi in full.