London’s Pleasance Theatre is about to mount  a new adapation  of John Gay’s forgotten gender-bending, anti-colonialist and proto-feminist ballad opera, Polly (The Heartbreak Opera) Bringing a gritty, vibrant energy to the scandalous sequel of The Beggar’s Opera, this new show features 18 original songs inspired by the likes of Britney Spears and Peaches. Think ‘Toxic’.…