What do you do when your South London drama school is on its last legs and your famous half-brother, Sir Ian McKellen, refuses to bankroll you a moment longer? Murray McKellen runs CACA: the Clapham Academy of Creative Arts. To be honest, it’s seen better days and more students. Once a place of almost-excellence - it managed to spawn the likes of Frances ‘Frankie’ Barber, albeit more by accident than design - but in recent years it has finally run out of both luck and money. So, turning to a documentary film-crew, in the hopes of boosting its notoriety and coffers, seems like a sensible idea. Sensible, until you meet the staff, that is.