[UTVLifer]

This seems to be a new thing now under the new Doctor Who, they film so far ahead of transmission. I remember during Tennant's first tenure, they would film a series over nine months, but it was always far closer to transmission than what they have now.

So, if they do continue to film so far ahead, which is what will happen as Ncuti is filming his second Christmas special already, it will lead to leaks happening.

They used to film 13/14 episodes in 9 months, but now, the 60th specials alone took 3 months to film last year. Whilst for the 8 episode S14/season 1 with Ncuti and Millie, filming started in December 2022 and didn't wrap until July 2023

Like someone else said, the much longer period needed for FX/post production now contributes massively to the longer production timescale