User:SOTO/Forum Archive/Inclusion debates/@comment-2.26.183.189-20170416191252/@comment-4028641-20170427141544
From Tardis Wiki, the free Doctor Who reference
Thought this is off-topic, with this very specific quote from the book, we can ascertain that the 2017 sections of series 10 take place before August.
Thus, and I'm basing this partially off of if FftF is valid, all of The Pilot up to after the Christmas "Bill looking at her Mum's pics" scene is set in 2016, while the rest (Heather staring at the puddle to the credits) is set in 2017.