It's not up to Moffat when the show airs - it's up to the BBC1 schedulers
Should make for a good weekend though, since Game Of Thrones is back on the Sunday (US) and Monday (UK) as well...
My thoughts precisely.
Isn't Liam Cunningham (GOT's Davos) in DW this season? (Or was that the first half of S7)
He's in episode 8, the submarine episode (he's the captain), along with David Warner.
Of course both shows get Diana Rigg in this year...