Loss register of special duties aircraft on
http://harringtonmuseum.org.uk/Carpe...umHomePage.htm
adds that intended DZ was at Venhuizen, which is near Enkhuizen along the west bank of the (former) Zuider Zee.
The register of lost aircraft in The Netherlands on nimh.nl doesn't mention EF234, so the Stirling may have disappeared over the North Sea.
On the other hand, many aircraft were found when large portions of the Zuider Zee were turned into polders, but the area around Enkhuizen is still water.
Regards,
Leendert