“Racing cars and pigs – who could better that?” Only Downton Abbey, which also presents a visit to Downton by Neville Chamberlain, where politics are thick and tempers are simmering – until an unexpected outburst, at that very tony dinner, that shakes the household to its core. For a rundown and reaction of each week’s Downton Abbey episode, see David Hinckley’s All Along the Watchtower. Check local listings.