Just over 50 years ago, an unassuming vet called Alf Wight, under the name James Herriot, put pen to paper and created the global phenomenon All Creatures Great and Small. With access to the film set and studios, Peter Wright and Shona Searson from The Yorkshire Vet experience 1940s Darrowby at Christmas, and get an unseen glimpse into the magic that the Christmas special has to offer.