The finale of hit thriller Bodyguard peaked with 11 million viewers, becoming the biggest TV drama since Downton Abbey.
The nail-biting BBC1 final instalment drew an average of 10.4 million and peak of 11 million – a 47.9% share – the biggest overnight figure for the entire series.
The episode is the biggest drama across all channels since much-loved period drama Downton Abbey aired in November 2011 on ITV, with 10.6 million viewers.
And it is the biggest BBC drama in 10 years, since the Christmas Day 2008 episode of Doctor Who, which attracted 11.7 million.
Excluding the World Cup, Bodyguard, starring Richard Madden and Keeley Hawes, is the number one programme of the year.
Creator Jed Mercurio thanked viewers “for a fantastic response to the series” with a message posted on Twitter.
The drama ended with a twist revealing who was responsible for the death of Home Secretary Julia Montague (Hawes).
Mercurio has hinted at the possibility of the BBC1 show returning for another series.
“If the ratings hadn’t been quite so high, then possibly everybody involved, including the BBC, would have said, ‘Well that was a nice little series but we’re just going to leave it at that and there won’t be any more’”, he told The Sun.
“We do feel very privileged and fortunate that there’s been such a response that it gives us that opportunity to at least think about doing more.”
He added: “We would probably approach any thoughts of a second series with the idea that it would create the opportunity for a third or fourth.”
The finale, which concluded with a revelation about the fatal explosion which killed Hawes’ character, had viewers gripped but divided by the ending.
And @Tommyblx wrote on Twitter: “How more British can you get that the final scenes in the biggest drama series in 20 years are a trip to occupational health and driving away in a Nissan.”
@ItsAlfieGreen wrote: “Bodyguard finale was so far fetched. As if he’d get a mental health appointment within a week ...”
The tense episode saw Army veteran and close protection officer Sergeant David Budd, played by Madden, strapped into a suicide vest.
Budd finally presented himself for counselling for his PTSD, and the finale hinted at a happy ending for the bodyguard and his wife.