Interesting:
Is Doctor Who’s Bill A Period Character From The Eighties?
http://www.bleedingcool.com/2016/04/24/is-doctor-whos-bill-a-period-character-from-the-eighties/
Plus (a) she doesn't know what a Dalek is and (b) the Doctor calls 2017 the future, when her first season will be shown in 2017.
Is Doctor Who’s Bill A Period Character From The Eighties?
http://www.bleedingcool.com/2016/04/24/is-doctor-whos-bill-a-period-character-from-the-eighties/

Plus (a) she doesn't know what a Dalek is and (b) the Doctor calls 2017 the future, when her first season will be shown in 2017.