In a parallel present where the latest must-have gadget for any busy family is a 'Synth' - a highly-developed robotic servant that's so similar to a real human it's transforming the way we live.

To coincide with the arrival of the second series of _Humans_, Gemma Chan – who plays the android Mia in the sci-fi drama – meets the folk from around the world making leaps and bounds in artificial ...