[3][6] On the outbreak of the Second World War, he served as an infantryman and travelled to India and China, becoming an officer in the Royal Corps of Signals.
[3] Yarrow returned to the UK and enrolled at the Northern Theatre School in Bradford, West Yorkshire, under the direction of Esme Church.
[3][6] After a brief spell in Manchester, Yarrow moved back to London, winning Tavistock Rep's playwriting competition for his play Ripple in Texas.
[3] In front of the camera, Yarrow was also known to Doctor Who fans for his portrayal of diminutive Exxilon leader Bellal in the 1974 serial Death to the Daleks.
[3] His other television appearances included roles in Crane, Ghost Squad, Coronation Street, Dr. Finlay's Casebook, The Onedin Line and London's Burning, as well as a part in the 1993 film Son of the Pink Panther.
[3] For the remainder of the 1980s, Yarrow joined the Royal Shakespeare Company, taking parts such as Justice Shallow in The Merry Wives of Windsor to Verges in Much Ado About Nothing.
In 1986, he performed a four-hour recital of all of Shakespeare’s sonnets to secure funding for his own play, Stitch, about an exploitative East End sweatshop.