We´ve come a long way in science since R2D2 and C3PO - androids are infinitely more human in their mannerisms and appearance.
We should applaud the producers of Corrie for taking the brave step of actually using an android actor but, really, there is a long way to go. Real people have expressions, they smile, they frown and (sadly) after about 30, they have facial lines.
The android playing Carla was, in so many ways, incredibly lifelike and the script had been programmed in perfectly but science needs to go still further before andriods can really be "human".