Details have recently emerged from the overseas transmission of Doomwatch on Canadian station CBC. We now have a dedicated page for this. If you can help add any information to it, please get in touch with us.
The CBC is responsible for retaining the only known copies of many episodes of Doomwatch, almost the entirety of Season 2 from episodes 1 to 12. Interestingly, Season 2, Episode 13 - Public Enemy was never shown but is the only one from Season 2 retained by the BBC in it's original 625 Line PAL format.
The information can be viewed here