Survivors is about an apocalyptic pandemic flu virus and the stories of a few with immunity. I'm guessing that the first episode has tracked the old storyline, albeit with modern numberplates. I also speculate the scale of deserted motorways and lensbabied citiscapes would have been difficult in the 70's version.
There is a BBC look to the production which also reminds me of some Doctor Who episodes. All the more interesting when the rumoured new Doctor Who turned up part way through, driving a Land Rover. And then at the end of the episode a secret location where the men in white coats look mysterious with lots of flashing lights.
It will be interesting to see if this can recreate some of the 'shared experience' viewing from the days of only four channels. I shall continue to view.