"S***, I really brought it down a notch," the Oscar-winning star joked.
The Sex Education star is joining Netflix's royal drama as Margaret Thatcher.
The Crown's Imelda Staunton Feeling 'Pressure From Every Angle' As She Prepares To Take Over Queen Role
The actor is succeeding Olivia Colman as the monarch in series five and six of Netflix's royal drama.
The likes of Olivia Colman, Jodie Comer, Paul Mescal and Thandie Newton had all been nominated.
The Oscar-winning star can currently be seen playing Queen Elizabeth II in Netflix's The Crown.
New footage shows Gillian Anderson as the former PM, as well as a first look at Diana on her wedding day.
After winning the Oscar for Best Actress last year, Olivia Colman was back on stage to present an award and was her usual charming self...
Including surprising performances, huge red carpet moments and even a couple of shock wins.
The Crown actress wasn't actually nominated at this year's Academy Awards, but still delivered one of the best moments of the night.
Series 5 will mark the end of the Netflix drama.