Indeed.I guess the law as it stands requires drivers to be in control of their car. The police take the view he wasn’t and have little choice but to uphold the law. Their response seems measured and appropriate to me under the circumstances.
At the end of the day if the Police clock you driving with no hands on the wheel for more than a few seconds you’re going to get done, regardless of what car you’re in or what its capabilities are, at least until the law changes to specifically accommodate fully autonomous driving.
The Road Vehicles (Construction and Use) Regulations 1986