An exact date has not yet been announced, but Series 3’s opening episode will definitely be broadcast at some point during BBC One’s festive fortnight of programing from 21 December.

> Find out all the details on Series 3 so far in our summary.

Are you looking forward to Series 3? Let us know below…

> Order Series 3 on DVD on Amazon.

> Buy the Series 1-2 boxset on Amazon.

Watch the Series 3 teaser trailer…