According to Hans Onderwater the Swordfish force-landed on 12/05/1940 in polder Oud Herkingen, near Herkingen on the isle of Overflakkee, on a field called 'de Munnik', owned by the Kardux brothers. The crew evaded via Antwerp to Ramsgate.
With thanks to Allert Goossens of
War over Holland, who sent me this information.