Oh boy. I've always been a fan of the playwright Abi Morgan - loved Sex Trafficking, though less keen on The Hour (which pinched its central situation from the film Broadcast News, without sustaining its power). But The Split is a real treat. A bit glossy, sure, and unashamedly feminist - big family drama, with Mum and three daughters, right? But it's so intelligent, and the fact that they're almost all divorce lawyers gives the scope for all kinds of exploration into middle-aged marriage/fidelity/honesty/cowardice/boredom. Beautifully done and acted, with tonight's climax a dinner party scene where lone rebel Nina decides this is the right moment to tall the rest of the family where they're going wrong - in detail,. and one at a time. They can all see it coming, knows she's had too much to drink, try to talk her out of it - but no. She wants this scene, so here it comes. Just wonderful.