In tonight's Cultural Exchange, C J Sansom - author of the historical crime series Shardlake - picks the first incarnation of the Doctor in Doctor Who, William Hartnell.

Christopher P. Tranchell is a British actor, best known for his role in the television drama Survivors as Paul Pitman.

He appeared in three different Doctor Who serials - The Massacre of St Bartholomew's Evein 1966, The Faceless Ones in 1967 and The Invasion of Time in 1978.

Other credits include: Z-Cars, The Onedin Line, The New Avengers and Play School.

Biography from the Wikipedia article, licensed under CC-BY-SA  

Appeared in the 1964 story The Sensorites

Appeared in many British TV productions during the sixties and seventies.

Victor Pemberton was a British writer and television producer.

Victor Pemberton's scriptwriting work included BBC radio plays, and television scripts for the BBC and ITV, including Doctor Who, The Slide and The Adventures of Black Beauty.

His television production work included the British version of Fraggle Rock (second series onwards), and several independent documentaries including the 1989 International Emmy Award-winning Gwen: A Juliet Remembered, about stage actress Gwen Ffrangcon-Davies.

In his earlier years Pemberton had several small screen acting roles. In addition to novelisations, he has written many nostalgic novels set in London, prompted by the success of his autobiographical radio drama series Our Family.

His partner for many years was the actor David Spenser.

In the Summer of 2016 Pemberton traveled to the Arctic circle to raise money for Help for Heroes.