Donald Houston as David "Dai Number 9" Jones

Meredith Edwards as Thomas 'Twm' Jones

Moira Lister as Jo

Alec Guinness as Whimple

Hugh Griffith as Huw Price

Joyce Grenfell as Mrs Pargiter

Clive Morton as Editor

Leslie Perrins as Burney

Edward Rigby as Beefeater

Mackenzie Ward as Photographer

Julie Milton as Bronwen

Peter Edwards as Davies Manager

Dorothy Bramhall as Jane

Andrew Leigh as Pawnbroker

Desmond Walter-Ellis as Station Announcer

Meadows White as Guv'nor

Gabrielle Brune as The Crooner

Ronnie Harries as Dan

Dudley Jones as Bleddyn

Diana Hope as A Customer

David Davies as The Burly Stranger

Tom Jones as Elderly Miner

Richard Littledale as Cinema Manager

Richard Davies as Rugby Fan (uncredited)

Patric Doonan as Conductor (uncredited)