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Have you got a calibre on it? My first thought when I saw it was that it was either a P-38 prototype or a Charola-Anitua pistol, but the C-A is more Mauserish, with the mag well in front of the trigger-guard.
From what I can find, it seems that Jurek was a Pole who escaped to the UK, and who had his designs built by Webley, so that may explain the "Webleyish" look to it; the book "Worldwide Webley" apparently has a picture, according to this: http://www.nfa.ca/miscellaneous/worldwide-webley-book-review.html