Some of the pins in the map linked to in the other thread are way adrift. I've noticed that in the past. It seems to be the ones that were there in the earlier version. (There are some more recent ones that are correct but some of the early ones are obviously corrupted.) For example, there's one talking about tidal mud near Truro but is placed near Hay-on-Wye! Many of the others seem to be similarly displaced.
That's the one that I'm talking about that has some of the marker pins that are 10s (if not 100s) of miles adrift from where they're supposed to be.
The snag is that you can't always tell whether a pin is right or wrong and, for the ones that are clearly wrong, you often can't work out where they're supposed to be.