We knew these were coming, but there's confirmation now that
Diamonds of the Night is coming in January next year, and
Dawson City Frozen Time is at some point in 2019. Looks like no releases in December 2018 then.
http://www.secondrundvd.com/comingsoon.html
I hope one of these gets added to HMV soon, I'm absolutely flummoxed about what I want to pair
Invention for Destruction with in the 2 for £25 offer