Reasons to Be Happy, Hampstead Theatre
Sequel-itis has spread to the stage. There's no caped crusader, but the troubled quartet of Neil LaBute's latest will be familiar to anyone who caught Reasons to be Pretty at the Almeida in 2011 " as will Soutra Gilmour's industrial crate set. We even begin the same way: in the middle of a foul-mouthed shouting match between relentlessly combative Steph and sometime-paramour Greg. But nostalgia value aside, this…