In the five steps from door to reception desk my photo has been taken, my face saved in the system and an ID number assigned. For the rest of my time in Great Ormond Street Hospital’s new high-tech unit in London, which opens today, I am followed by an AI.

Video screens show my head in a red box, annotated with a score showing how confident the computer is that I am who it thinks I am.

Tracking systems like this are just one of the …