Ashmore was the son of William Oliver Ashmore, undertaker, and his wife Marie Cavaliero. After attending The Central School of Speech and Drama, Swiss Cottage, Ashmore made his professional debut in 1934 in
Windfall at the Embassy Theatre, London. He followed this by performing in
Romeo and Juliet at Stratford-upon-Avon and featured in various productions at the Embassy, Phoenix, Mercury and Little theatres. He was a conscientious objector during the Second World War and made his reputation as a director at the Oxford Playhouse during the years 1941 and 1946. The actors in the company included
Pamela Brown,
Yvonne Mitchell,
Isabel Dean and
Rosalie Crutchley who was to become his wife. Noted productions during this period were
Hedda Gabler with Pamela Brown and
Uncle Vanya in which Ashmore played Vanya to Rosalie Crutchley's Sonia. In 1946 Kitty Black, an agent working for Binkie Beaumont's H M Tennent theatrical management company, persuaded him to return to London, having been impressed with his directing at the Oxford Playhouse repertory theatre. He staged T.W. Robertson's play
Caste at the Lyric Theatre, Hammersmith. Ashmore's first big commercial hit was in 1947 when he directed
Robert Morley and
Peggy Ashcroft in
Edward, My Son at His Majesty's Theatre. The play was so successful that the production transferred to Broadway, New York. Then in 1949 it was made into a film produced by Metro-Goldwyn-Mayer, starring Spencer Tracy and Deborah Kerr. From 1946 onwards and throughout the 1950s he worked continuously in London's West End, as well directing several plays on Broadway including the well received
Legend of the Lovers ( from Jean Anouilh's Eurydice ) starring
Richard Burton and Dorothy McGuire at the Plymouth Theatre, New York 1951 and the
Master of Thornfield with
Errol Flynn in 1958.
To Dorothy, a Son (1951), a farcical comedy by Roger McDougall starring Richard Attenborough and his wife Sheila Sim was another big success for Ashmore. It was made into a movie in 1954 starring Shelley Winters, John Gregson and Peggy Cummins. The last play Ashmore directed was
Mr Rhodes, a play about
Cecil Rhodes (1961) starring Robert Morley but the play was a flop on tour and never reached the West End. Ashmore decided to give up directing and lived on his boat for while in the South of France. Then he took his boat to Stockholm where he met the woman who was to be his second wife, Swedish school teacher Petra Gullstrand. Philip Purser, in his Guardian Obituary for Peter Ashmore, notes the sad coincidence that: "The actresses Rosalie Crutchley (obituary, July 31) and Isabel Dean (August 6) who had been friends since they were fellow members of Ashmore's Oxford Playhouse company during the war, died within 24 hours of each other. Ashmore, who was married to Crutchley for 13 years and father of her two children, had died one day earlier." ==Theatre==