Ingleby studied at the Accrington and Rossendale College before progressing to the drama school LAMDA in London.
In 2001 he starred in and wrote the screenplay for the short film Cracks In The Ceiling, which he appeared in with his father, Gordon Ingleby.
One of his more recent projects was the 2006 television adaptation of The Wind in the Willows, in which he played Mole. It also starred Bob Hoskins as Badger, Matt Lucas as Toad, and Mark Gatiss as Ratty. He played the role of DS John Bacchus in the BBC crime drama George Gently. He is working on a modernised BBC adaptation of Rapunzel.