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Seguy gives the size as 2.25 to 2.5mm, so I think Ben's estimate is near enough. I agree the head shape looks a little flat compared to Brake's photo, but that is actually dorso-lateral (both antennae are clearly visible), rather than strictly lateral, as in Ben's photo. This could explain the difference. Tomorrow I hope to compare specimens to the photo (I haven't got any at home), so we should be able to resolve it then.
I note that Fauna Europaea does not record any Madiza from the Netherlands. Is this another reason for your doubt? ;)