Thanks for the nice feedback.
The girl is ~30mm to the eyes and the robot ~42mm (to its single eye). Thus, I'd say it qualifies as a modern (smallish) 28mm miniature, in particular given the slender proportions.
It's a limited edition studio McVey sculpt. They are expensive but amazingly detailed, crisp and superbly cast (except this one that apparently made it through all the quality controls!). Their service is excellent and I have no doubt they would have replaced it if I had complained.