I propose a hypothesis: Wife of king Richard II, Ann of Bohemia (1366 - 1394), was a daughter of Charles IV, the emperor of the Holy Roman Empire and king of Bohemia. While she was queen of England, there were very active relations between English and Bohemian kingdoms. And one of Charles IV's sons Wenceslas IV (1361-1419), king of Bohemia, had kingfisher in his personal heraldry:
![Image](http://simonak.eu/images/obrazky_ostatni_strany/h_k/2_26_8.jpg)
![Image](http://ao-institut.cz/texty/Ceske-dejiny/img/vaclav-IV-lednacek.jpg)