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Metopia argyrocephala - thanks, Tony and Jürgen.
@ Jürgen: Yes of course it's not the eyes themselves that are white, but spots between the eyes.

Looking now for more info on Metopia argyrocephala I read that it parasites different species of hole-digging Apidae and Sphecidae. Which fits perfectly, as I found it sitting in a sandy area with lots of Sphecidae & their holes around...

Very interesting - thanks!

Chris