[3] Gostelow went to England in 1950 and worked in the theatre (regional repertory), including the Royal Shakespeare Company and various roles on British television.

[4] In Shakespeare he was especially associated with the role of the alcoholic reprobate Bardolph in the Henriad plays.

[5] He played the parts of Perks in the 1968 TV serial of The Railway Children, Milo Clancey in the Doctor Who serial The Space Pirates in 1969, and the Duke of Medina Sidonia in Elizabeth R.[6] Between 1969 and 1970 he also narrated in twelve episodes of BBC children's television series Jackanory.

[7] He appeared in a 1999 episode of Midsomer Murders, entitled "Death's Shadow".

[8] His film career included roles in Dr. Syn, Alias the Scarecrow (1963), The Idol (1966), Nicholas and Alexandra (1971), The Day Christ Died (1980, as Nicodemus), The Scarlet Pimpernel (1982), and How to Get Ahead in Advertising (1989).