Background
In 'The Reality War', the Fifteenth Doctor, played by Ncuti Gatwa, appears to regenerate into a new incarnation of Doctor Who's titular character played by Billie Piper. There has, however, been no official confirmation that Billie Piper has been cast as the Sixteenth Doctor.
Resolution criteria
This market will resolve YES if, by the end of 2028, Billie Piper appears in a televised Doctor Who episode in which she is credited as The Doctor, and the BBC confirms that she plays the Sixteenth Doctor.
This market will resolve NO if someone other than Billie Piper is confirmed as the Sixteenth Doctor by the BBC, or if the matter is unresolved at the end of 2028.
Clarifications
For the purpose of this market:
A televised Doctor Who episode is an episode of Doctor Who with a minimum duration of 20 minutes, broadcast on television or released on a streaming service.
Being credited as The Doctor includes credits for any character name that is synonymous with or hyponymous of 'The Doctor', such as 'Doctor Who' or 'The Sixteenth Doctor'.
In the event that Doctor Who moves to a UK broadcaster other than the BBC, references to the BBC in the resolution criteria may be substituted for the new broadcaster.
In order for an actor to be confirmed as the Sixteenth Doctor, they must be described as 'the Sixteenth Doctor' or 'the 16th Doctor' in official material. A press release from the broadcaster is sufficient.