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Timothy has shed some serious pounds after beginning his weight loss transformation in 2014
The legendary British actor looked the picture of health as he rocked a dapper grey suit that displayed his slimmed-down frame at the event, which was held inside the city's Ham Yard Hotel.
Walking the red carpet, the Harry Potter star cut a dapper figure in a grey three-piece suit that boasted a contrasting navy waistcoat.
Injecting a touch of personality into his ensemble, he opted for a quirky polka dot tie as he promoted the movie alongside co-star Andrew Scott.
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Timothy radiated happiness as he smiled and laughed with his co-stars and the many photographers that snapped away at the star.
The Auf Wiedersehen, Pet star began his body overhaul back in 2014 and has seemingly managed to stick to his healthier lifestyle.
It's possible that the star was inspired by his son, fellow actor Rafe Spall, who decided to shift the pounds after weighing in at 18.5 stone.
Timothy was joined by co-stars Tom Wilkinson and Andrew Scott at the event
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Timothy looked dapper in a grey three-piece suit
Speaking about his decision to lose weight at the time, the Prometheus actor told the Daily Mail: "I was a glutton. I loved food. I still do.
"But I didn't have a thing in my mind that told me when to stop eating. There's something of a chunky gene in the Spall side of the family. I was always chubby, then I got fat.
"When I was in my early 20s I was 18 and a half stone. You don't control it. I think you get to a certain point where you think, 'Sod it. There's no point doing anything about it because I'm fat now and it's going to take a massive revolution in order to face this, so I may as well carry on the way I am.'"