Seeing an actor transform on screen and wondering if it was the role or life itself that changed him is subtly fascinating. Since the release of Series 6 in late September 2025, Callum Woodhouse—best known today as the amiable, mischievous Tristan Farnon in Channel 5’s All Creatures Great and Small—has drawn a particular kind of viewer attention. He has a different appearance. He seemed heavier, fuller, and more at ease with himself. Additionally, people have opinions about it.
Woodhouse has never sought attention or courted controversy. His breakthrough role as Leslie Durrell in ITV’s The Durrells, a sun-drenched comedy-drama set in 1930s Corfu, came from regional theatre and small television roles. He was born in Stockton-on-Tees in 1994. Woodhouse portrayed Leslie with a kind of gleeful recklessness that suggested he understood characters who live with little self-awareness. Leslie was lanky, impetuous, and generally unaware. The endearing younger brother of a Yorkshire veterinary practice, Tristan Farnon, possesses the same trait. He prefers to be in a pub rather than a consultation room, but he consistently performs well when it matters.
Fans noticed that the Callum Woodhouse of Series 6 looked very different from the slender young actor who first appeared on the Yorkshire Dales in 2020, first in quiet Facebook groups and then in Reddit threads that became unexpectedly heated. “He looks extra hot this season with a little weight gain” was one genuinely warm comment, while others expressed a sort of nostalgic preference for previous seasons. It’s the kind of online conversation that reveals more about viewers than it does about the actor. People become attached to a particular version of someone, and when that version changes, they experience a little grief.
In an interview conducted before Series 6, Woodhouse directly addressed the change, stating that Tristan “has changed quite dramatically.” Here, context is important. After serving in the military during World War II, Tristan returns to Darrowby, and the show is now set in 1945. After years of uncertainty, peril, and institutional life, a man would not look the same. It’s possible that the physical alteration was completely intentional, a decision made in tandem with the production to illustrate the effects of war on an individual. During that time, serving in the military meant experiencing different foods, rhythms, and levels of stress. Individuals returned with changes that weren’t always obvious but occasionally were.
There’s a feeling that viewers don’t realize how much serious character work involves physical transformation. Christian Bale is renowned for changing his body for a variety of roles. Renée Zellweger underwent intense scrutiny after gaining weight for Bridget Jones. While Woodhouse’s circumstances differ in scope, they are not wholly dissimilar in nature. When a Facebook commenter pointed out that the weight gain was “done to give it credibility,” it touched on something genuine: the notion that Tristan should look different at 30-something, post-war, settling into something more permanent than Tristan at 25, avoiding responsibility.
Actor Woodhouse has never been a loud performer. In interviews, he frequently talks about how much he enjoys his work, how he gets along with his co-stars, and how playing a cheerful character like Tristan makes him feel better even on bad mornings. His closest on-screen collaborator is Nicholas Ralph, who portrays James Herriot, and the two have maintained a chemistry that feels genuinely earned rather than manufactured. It’s difficult to maintain that level of warmth over six series. It’s difficult to ignore the fact that despite the physical changes, Woodhouse’s fundamental contribution to Tristan—that slightly reckless generosity of spirit—remains the same.
In the end, the weight gain discussion highlights how much attention actors receive and how little control they have over their physical appearance once a character gains popularity. Callum Woodhouse, who entered the set at age 26, is no longer the same person at age 32. Even though it seems clear when put simply, people are still taken aback by it. It’s unclear if the change was a conscious creative choice, medically incidental, or personally circumstantial, and maybe it doesn’t have to be. After the war, Tristan Farnon was a little different. The actor portraying him did the same. Perhaps that is precisely the point.
