I recently received (not from Amazon, but from a retailer that offers just a return and refund) one of the well-documented faulty DVDs .. so they still exist. I contacted Abbey Home Media at the only obvious address they provide, but twice received no answer. So it looks like I'm stuck with it (because it was quite cheap).
What others with the faulty disc may like to know is that the 'missing' end of the Miss Jessop episode IS on the disc - it's just not referenced from the menus. You can watch it on a computer with VLC media player (or similar - but not Windows Media Player or similar) by opening the file VTS_01_4.VOB which contains (somewhere around its middle) the whole episode. This only works because the disc appears not to be copy-protected (otherwise playing an isolated .VOB file would give a scrambled picture).
The programme itself is a delightful reminder of when children's TV was calmer and wittier (and stranger) than it generally is now. One star off for the picture quality, which I suspect is not quite as good as it could be.