I suspect these may have come from the same source as a group I had a few years ago, from a farm in the east of Essex! I managed to get half a dozen or so reasonable ones, from around 15 to 20 in total, leaving the really bad ones behind. I believe the story was that a farmer had bought a load of them when they were taken down, and built them into a pig sty! The sty was demolished some years back, but the farmer had kept the better ones!