It is widely expected that Justin Welby, having now screwed the crown on Charles III’s head, will shortly retire as Archbishop of Canterbury and put himself out to grass. If so, he is not going quietly. This afternoon, in the House of Lords, he launched a wholesale attack on the government’s Illegal Migration Bill, which includes measures to offshore the processing of asylum-seekers in Rwanda, describing it as ‘isolationist, morally unacceptable and politically impractical’ to leave developing countries to handle the world’s refugees.