British Empire Staff Cars

[T. Metsovitis]

Hello all,

I am afraid that I am terrible at car recognition . Could any of you more knowledgeable gents please tell me what this is? It was in use by the Royal Hellenic Air Force in 1940. The front end looks like an Opel Olympia but it has a split windscreen, the rear wings are different and the side-lights on the front wings are not Opel.
I wish I could get those blokes out of the way .

Thanks in advance

Fyll