The big returning show of the week began with servants laying out the silverware at a large country house in 1924. But rather than a shock comeback for Downton Abbey, this was — perhaps even more unexpectedly — Tommy Shelby’s new home in Peaky Blinders (BBC2, Thursday). Which explains why so many of the guests were carrying guns, and why the family matriarch was using the word ‘fuck’ a lot more than Lady Grantham ever did.