Went to my local car boot to try find an original MP being sold for £3 by some old duffer. Unfortunately, no MPs but I did buy a Retinette IB and an Olympus Pen D. Neither looked as though they've ever been used and the selenium meters, shutters and mechanics all work beautifully. I have used a Pen and an older Retinette in the not too distant past. Both produced images similar to a Holga; milky, out of focus etc. I developed the two films by the cameras tonight and was amazed at the results. The photos themselves are uninteresting but the image quality the two cameras (especially the Retinette) produce are, I think, incredible.
Grand total: £9!
The first two images are from the Retinette the subsequent two from the Pan D