"He has no more ever called himself the 11th Doctor than he would call himself Matt Smith. The Doctor doesn’t know off the top of his head [what number he is]" Moffat said.

John Hurt is the War Doctor – and thus outside the numbering, apparently. But, actually not really.

"Specifically - John Hurt’s Doctor doesn’t use the title - The Doctor. " Moffat said.

"[Matt Smith's Doctor] is in his 12th body but he’s the 11th Doctor, however there is no such character as the 11th Doctor – he’s just "the Doctor" – that’s what he calls himself." Moffat said.

"The numbering doesn’t matter, except for those lists, that you and I have been making for many years,’ he said. ‘So I’ve given you the option of not counting John Hurt numerically – he’s the War Doctor."Moffat said.

However, Peter Capaldi’s Doctor is his last body, barring some sort of time lord shenanigans to get him a fresh set of 12.