| Peter's first major (title) role as an adult was in the title role in a 1976 BBC Television Play of the Month adaptation of Oscar Wilde's novel The Picture of Dorian Gray. |
| Peter is very good friends with his Equus (1977) co-star Jenny Agutter, who also starred with him in Spooks (aka in the US as MI-5 (2002). |
| Peter has an extensive career onstage in the UK and on Broadway. |
| In July 1973, Peter received his big break by winning the leading role of disturbed adolescent Alan Strang in Peter Shaffer's play Equus, which was performed by the National Theatre at the Old Vic in London. |
| As a youth, Peter took weekend classes at the Bradford Playhouse near his Pudsey home. |
| Peter admits that he initially became interested in acting because he liked this girl who was apart of a local theatre group, he joined to impress her. |
| In 1977, Peter won the Evening Standard British Film Award for Most Promising Newcomer - Actor. |
| In 1978, Peter was nominated for an Oscar for Best Actor in a Supporting Role for: Equus (1977). |
| Peter left school at the age of 16 to pursue his career in acting. |
| Peter made his film debut at the age of 18 in Franco Zeffirelli's Fratello sole, sorella luna (1972). |
| Peter was a child actor on British television, who began his career in 1968. |
| Peter played his most notable character Alan Strang in both the play, and film version of Equus. |
| Peter is approximately 5' 9" (1.75 m) tall. |
| Peter played Wolfgang Amadeus Mozart in the Broadway production of Peter Shaffer's Amadeus in 1981, with Sir Ian McKellen as Salieri. |
| Peter was nominated for Broadway's 1975 Tony Award for Best Actor (Dramatic) in the play Equus. |
| Peter was listed as one of twelve "Promising New Actors of 1977" in John Willis' Screen World, Vol. 29. [1977]. |
| Peter is divorced and the father of four children. |
| Dated/dating actress Caroline Langrishe. |