Callum has starred in two television series based on semi-autobiographical books written by real life animal lovers.
1. The Durrells, based on The Corfu trilogy by Gerald Durrell (Zoologist)
2. All Creatures Great and Small, based on the books of the same name by James Herriot (Vet)
In both productions Callum's character battles with being a 'good' brother and finding love. Both are set before/during World War 2.