We thought it might canter on forever, but after seven years, over 3,000 performances and around 2.7m tickets shifted – not to mention inspiring Stephen Spielberg to make a film of the same source book – the National Theatre’s puppet-powered First World War drama ‘War Horse’ will gallop off into the sunset next year. It’s just announced one final extension at the New London Theatre: it will now shut on March 12 2016. The closure of ‘War Horse’ may have a surprisingly big impact on London. On the one hand, its blockbuster success has generated £12m in profit for the NT, sheltering it from the full impact of recent government funding cuts. And on the other, the ’60s-built New London Theatre is a notoriously difficult venue to convincingly put a show in – arguably 'War Horse' and 'Cats' are the only two productions to have really 'worked' there. But the main thing you should know is that it’s a brilliant, brilliant show and that you should try and catch it before it goes off to that great stable in the sky.