Hi Mark,
According to page 15 of Martin Bowman's "Mosquito Reconnaissance Units of World War 2" found here:
http://books.google.com/books?id=Gx85T-eYPdQC&pg=PA15&lpg=PA15&dq=DZ364+mosquito&source=b l&ots=Y-RUWMop-x&sig=0TFAfoZ97FzxWCbfx30KG1Y0gIk&hl=en&ei=bq41S92 PK8KF-Qbf68iuCg&sa=X&oi=book_result&ct=result&resnum=1&v ed=0CAgQ6AEwAA#v=onepage&q=DZ364%20mosquito&f=fals e
it was a PR VIII, lost on 18 March, 1943. Even with the spelling as Custance, nothing shows on CGWC nor are there any 540 Sqn losses listed for that day on Geoff's search engine.
Regards,
Dave
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