Jon,
I've worked on Norada, as well as a number of other Wherries. I was the Skipper on Albion for a number of years taking charter parties on trips around the rivers and Broads of Norfolk and Suffolk. It was good fun but age and an increasingly uncooperative back ( plus other factors which I won't go into here ) made me retire from it and concentrate on sailing my own Lug sailed boat.
As for the Wherries, there are actual 7 left, Ardea, Albion, Maud, Olive, Norada, White Moth, and Hathor.