Image copyright AFP/PA Image caption Theresa May's approval was confirmed in a statement from her spokesman

The new Doctor has a friend in Downing Street, with Theresa May saying she is "pleased" by Jodie Whittaker's casting.

The front door of Number 10 featured in a teaser trailing the new Doctor's unveiling, leading many to speculate the next Time Lord would be female, just like its current incumbent.

Others to welcome Whittaker's casting include Star Wars' John Boyega, who predicted she would be "awesome".

Actress Karen Gillan also signalled her approval with an enthusiastic tweet.

"Jodie Jodie Jodie Jodie Jodie!!!!!!!!!!!!!!" the former Doctor Who companion wrote on Twitter.

"Congratulations Jodie Whittaker!" tweeted Sylvester McCoy, who played the Doctor from 1987 to 1989. "One small step for women, one giant leap for womenkind."

Gillian Anderson, David Harewood and former Bake Off co-host Sue Perkins also applauded her imminent arrival on social media.

Image copyright @GillianA

Image copyright @DavidHarewood

Image copyright @sueperkins

An estimated 4.6 million viewers were watching BBC One when the identity of the new Doctor was revealed on Sunday afternoon.

The video unveiling Whittaker as the Thirteenth Doctor has been watched more than 16 million times online.

Whittaker, 35, was seen approaching the Tardis in a clip broadcast at the end of the Wimbledon men's singles final.

The news was covered extensively in Monday's newspapers, several of which put Whittaker's face on their front pages.

Amid the euphoria, though, came an element of confusion over where the actress fits into the Doctor Who chronology.

Media playback is unsupported on your device Media caption Former writer for Doctor Who tells Today fans don't need to be worried about the character's gender

Whittaker, best known for her role in ITV drama Broadchurch, has been billed by the BBC as "the 13th Doctor".

Yet the late Sir John Hurt played an iteration of the Doctor in the show's 50th anniversary special, leading some fans to question whether Whittaker's Time Lord will indeed be the character's 13th incarnation.

According to the BBC's Lizo Mzimba, however, Sir John does not have the same numerical status as the other actors to play the role, which in recent years have included Matt Smith, David Tennant and Peter Capaldi.

Image caption Sir John Hurt (right) appeared with Matt Smith and David Tennant in The Day of the Doctor

"In 2013, John Hurt played an incarnation of the Time Lord who was retroactively revealed to have come in the Doctor Who timeline between the eighth Doctor, Paul McGann, and the ninth Doctor, Christopher Eccleston," he explains.

"But Hurt's 'War Doctor' rejected referring to himself as 'The Doctor', meaning the long-established numerical order was maintained."

Peter Cushing - who played the Doctor in 1965 film Dr Who and the Daleks and 1966's Daleks - Invasion Earth: 2150 A.D. - similarly stands apart from the official lineage that began with William Hartnell in 1963.

"Cushing's two appearances are not considered part of the main Doctor Who TV timeline," continues Mzimba.

"In the films he played a human scientist who invented a time machine, rather than a Time Lord from Gallifrey."

Image caption Whittaker will soon be seen in BBC One drama Trust Me

Before Broadchurch, Whittaker was seen opposite Peter O'Toole in the 2006 film Venus, alongside Boyega in 2011's Attack the Block, and as a firefighter's girlfriend in Sky 1's The Smoke.

Before making her debut as the Doctor in the Christmas episode of Doctor Who, the Huddersfield native will be seen as a nurse who pretends to be a doctor in BBC One drama Trust Me.

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