Young Vic, LondonA guest star " here, a delighted Jessie Buckley " is fed their script during the performance in this now two-decade-old revelation of theatre-making An Oak Tree unpicks what it means to make-believe. Returning for a 20th anniversary production, Tim Crouch's tricksy two-hander sees him toy with a guest star who has never seen the script before they are fed it, piece by piece, in front of an audience. …