In the novel A Pocket Full of Rye, Mr Crump is the butler at Yewtree Lodge. He is married to Mrs Crump the cook. He is described as having a "rather spurious air of smartness, a shifty eye and a rather unsteady hand". According to Mary Dove, he "just makes the grade" as a butler, as his silver is all right, and his waiting at table is not too bad.
In the BBC 1985 adaptation of the novel which formed part of the Miss Marple series, the part of Crump is played by Frank Mills. In this adaptation, his first name is Reginald. In the novel, his first name is not given.
In the ITV 2008 adaptation of the novel (Episode 1, Season 4 of Agatha Christie's Marple), the part of Crump is played by Ken Campbell.