Who is the prime minister's most senior adviser, Dominic Cummings?

Boris Johnson's most senior adviser, Dominic Cummings, has rejected claims from a Tory MP that he is arrogant about the constitution. On today's Daily podcast, we look into the career of the former Vote Leave mastermind. Plus, Sky News Crime Correspondent Martin Brunt reflects on the conviction of a serial conman who wrote to him from prison.