All Creatures Great and Small starring Christopher Timothy.
Iain de Caestecker (represented by Hamilton Hodell) takes the title role of Young James, a bright, idealistic young man and the drama follows his student exploits with close university friends Whirly Tyson and Rob McAloon.
Iain, himself originally from Glasgow, played Adam Barlow in Coronation Street, and will also be seen this year in the lead role in new BBC Three thriller The Fades.
Scottish actress Amy Manson (represented by Independent Talent) who played vampire Daisy in Being Human, and Fleur in Outcasts, plays Whirly Tyson. And Ben Lloyd-Hughes (represented by Curtis Brown) who recently played Ed Miliband, alongside his brother Henry as David Miliband, stars as Rob McAloon.
The drama draws on unprecedented exclusive access to an astonishing archive from veterinary surgeon Alf Wight, who wrote under the pseudonym James Herriot. This includes the diaries and case notes he kept during his student years, together with the authorised biography written by his son, Jim Wight.
Herriot would become one of Britain's best-loved authors and an inspiration for films and the long-running TV series, All Creatures Great And Small, which encouraged many others to follow in his footsteps.
Young James also stars Natasha Little (Case Histories), Ralph Riach (South Riding) and Joanna Vanderham who recently starred in Sky1's The Runaway.
Written by Ann McManus, Eileen Gallagher and Damian Wayling, and directed by Michael Keillor, Young James is due to be shown on BBC One in the Autumn.