I can't see the need for him to be prosecuted, nor any possibility he will, to be honest. Things like that were unfortunately commonplace in those days, I've lost count of the times my bum was lightly tapped in an office environment in the 1980's
If anyone on here as actually read the full link, its plain to see that Caroline Noakes was not 'traumatised' in any way but the incident prompted her to 'make a fuss' and confront any inappropriate behaviour following that experience. Quote:
""I now regard it as a duty, an absolute duty, to call out wherever you see it. Be the noisy, aggravating, aggressive woman in the room because if I'm not prepared to do that, then my daughter won't be prepared to do that... you do get to a point where you go 'up with this, I will not put'."