OK, I've checked out the copy of 'Good News' that came from the Ebay Seller discussed and I can't see any difference at all. However that and the others that have been sold on the site were pressed at at least two different European plants, not the dodgy UK one responsible for the later over-presses. I think it's unlikely that anyone could have re-pressed from the masters, the labels would have had to have been identical too. I'm flummoxed.
Hopefully the seller has accumulated some over the years and is flogging them off, which is also unlikely. I think we're talking about relatively small numbers though and only a few titles - time will tell. Maybe I'll pop round and ask them next time I'm up.
The titles that were over-pressed are - I think
Smith Brothers
Lorraine Chandler
Sandra Richardson
Nancy Wilcox
Also the Classic Example is the only one I know definitely was but because I marked them they haven't appeared on the market.