Programmes that pull together a bunch of festival turns are often ragged and random - not this one. As your compere Arthur Smith explains at the top of the show, all the acts have at least a modicum of BBC4 sensibility about them. Alex Horne and his, um, Horne Section offer silly but dazzling musical comedy, while Tim Key does something similarly clever and stupid with his poems. David O'Doherty has a Bontempi organ and a unique way with words, while Nina Conti offers an ingenious and brilliantly improvised variation on her familiar ventriloquist routine.