They are thought to have been brought over with Vikings. I got eggs from a farm last year that keeps indigenous breeds and got a hen to sit on them. I will have to have a look at the Bibbed Hook Bill Ducks then.
Well Hook Bills came here from Holland but originated in Asia I believe. They were released onto the canals in Holland by their owners to feed and the white 'bib' was to distinguish them from wild ducks to the hunters.
Here is a photo I took at the British Waterfowl Association National last year - it won best hookbill - a really sweet little duck, very friendly.