By John Stevens Rishi Sunak has been warned he is a “dead man walking” as Tory rebels threaten to sink his Rwanda legislation in January unless he gives into their demands. The PM was given a stay of execution as he survived a crunch vote in Parliament on a new law he says will get deportation flights off the ground. But critics said he had merely delayed his nightmare until after the Christmas break. Dozens of Tories defied Mr Sunak by refusing to back emergency legislation, which passed by 313 votes to 269. In a major revolt, 29 Conservative MPs failed to vote despite not having permission t…