The TV host, 43, sipped on a hot beverage as he hopped into his flashy Range Rover ahead of filming later that day.
After a year away from the spotlight, the 43-year-old will officially be back alongside Donnelly for this year's series.
The Geordie native wrapped up against the cold weather in an all-black ensemble, which featured a baseball cap, longline coat and sturdy knee-high boots.
His longtime on-screen partner Declan Donelly hosted the live Britain's Got Talent shows solo past year and was joined by Holly Willoughby for the 2018 series of I'm A Celebrity.
He told the Mirror: 'It's back to normal for BGT - fingers crossed it will be great'.
Britain's Got Talent, which features judges Simon Cowell, Amanda Holden, David Walliams and Alesha Dixon, will be broadcast on ITV later this year.
For I'm a Celebrity...
Ant McPartlin has been confirmed for the new series of Britain's Got Talent.
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At the Dancing On Ice launch, Holly said: 'It was a one-off, once in a lifetime adventure.
"High standards are expected of me, I expect them of myself".
Dec added: 'Whilst I am obviously sad at the thought of being without my best friend in Australia this year, I am proud of the work Ant has been doing privately and I am fully supportive of his decision.
Now the beloved presenter, who forms one half of the country's most popular presenting duo alongside Declan Donnelly, is returning to work.
McPartlin checked into rehab in 2017 after struggling with a two-year painkiller addiction following a knee operation.
Ant was arrested after being involved in a collision while driving under the influence.
McPartlin was suspended from driving for 20 months and received an £86,000 fine after crashing his Mini Cooper while more than two times over the legal drink-driving limit.
He announced he would immediately be taking time out from presenting and was seeking treatment for addiction.
Filming for the talent show begins this week in London, which means Ant and Dec will be on hand to present the show and keep auditionees relaxed backstage. Holly has been fantastic too, just brilliant.