I watched and with interest last night and found the round table discussions extremely thought provoking.
I was very surprised to see the 'no retaliation' vote at the end. Surely the PM of the day would (in that scenario) be under incredible political pressure to retaliate? Although, there probably won't be many left to judge his actions of course.
I believe Denis Healy is the only person in political power within a 'firing chain' to have previously said at a similar point he would have not authorised retaliation 'as the deterrent would have failed'.
I know this was a dramatization, and the people 'making the decisions' were removed from power, but there were some incredibly experienced Military men/Diplomats in the room, and you wonder how different a real life scenario would be.