I think the real problem with Humans (the TV series) is simply that what we generally work on in terms of what we regard as human consciousness is in many ways related to appearance. Given that it seems impossible to break down the problem of hard solipsism, we work on the basis of empathy by looking alike. The others may all be zombies but we know we, the individual is not, and we judge that by their similarity to us visually and by communication. There are sensible reasons why the Turing Test is nit done face to monitor but monitor to monitor. Should we have something indistinguishable from us visually we would give a pass everytime.
Perhaps that is the reason for the unhappy valley that exists for humans dealing with robots that look almost like us, the weird quivering idea that if we treat them as almost real, it will expose everyone else to us, and vice versa, as almost false. I have gazed in the eyes of a man about to punch someone and an orangutan about to pick a banana and I felt more understanding and empathy with the orangutan by far. Most of my communication is not verbal, almost none of my empathy is.
Alan is right in that even in experiencing the sole consciousness we do directly, we have no real understanding of it, but it is mere incredulous line drawing to think that it is those that look enough like us, or use a specific means of communication, as opposed to all the others we share, that somehow have moved across an invisible line, and that line is a significant line in terms of worth.