I am searching for any information about my father Karsten (Karl) Oygard. He served on Norwegian corvettes Potentilla, Tunsberg Castle & Buttercup. I have absolutely no information from 1943, but he did say that he had been in Norway during the war! I am also interested in any hospital records from Londonderry and Bristol. He also attended a dinner hosted by King Haakon in London (approx 1946). Any information on this will be gratefully received.