There is something deliciously improper about watching Elizabeth McGovern perform on stage in a rock band. The sight of a middle-aged mother, even one as coolly attractive as McGovern, playing a guitar and singing in a beer-splattered festival setting is necessarily out of the ordinary. But it's the contrast with Lady Cora, the delicate Edwardian matriarch she plays in Downton Abbey, that really plays havoc with the imagination.
As the lead singer and songwriter of Sadie and the Hotheads, McGovern has created a kind of supercharged alter-ego, a private weekend hobby that has blossomed into a fully fledged album-producing and touring entity. Earlier in the summer,