Oh thanks! The links are great!! Anyone who hasn't seen the episode will otherwise have no clue what I'm talking about... so am grateful for the links. Yes - definitely a spine-chilling concept.
I love Black Mirror. Certainly, as masterful as it is it can be draining. It doesn't always fit within my emotional budget. I can't complain about it, though. I wouldn't give it up for anything. We were due for another Rod Serling.