Hello Andy,
All sources I have are the CWCG-database and the Slagveld Sloedam-site.
On the last I found
some additional information regarding the Wellington:
it crashed on (Dutch time?) 01.18 hrs 22/06/1940 in the sea near Stavenisse.
Also on the Sloedam site are a number of other unknown airman, presumably died 22/06/1943, and - according to the maker of that site - belonging to a
Lancaster that crashed 17/06/1943.
Since Flushing is 300 km from where I live I cannot check on the Cemetery if F/Sgt Parkinson is or isn't buried there. I'll try to contact the maker of the site - maybe he knows more.
The information given about the unknown airmen on the Sloedam site is extraordinary - in the coming days I'll present more unknown who might be identified.
Regards,
Bart