It's a stunning piece - I've just been watching the second half again. The actor who takes the part of the prince has given him very convincing mannerisms, like those of a boy with Asperger's I have taught. And has a most entrancing smile.
If his problem was autistic spectrum disorder, the play made clear that there were hints of odd obsessive behaviours among others in the family. Makes one look at the current bunch with new eyes.
He was lucky, though - they had the resources to push him off into an isolated cottage with friendly retainers. With the doctors' advice the family were given, a commoner would have ended up institutionalised in one of the great blocky asylums somewhere in the country.

Penny