The problems of how to get scratchings, eh? Outside the golden area of the Midlands, there are very few in the supermarkets or anywhere else: Red Mill seem to be the most widely available.  In the Midlands, they are available in butchers, supermarkets, corner shops, garages and, probably, Holland & Barrett. There may be a few places selling cards of small packs via the internet. If you find anywhere, particularly places selling decent size packs, do let us know.
For now, Mr P's Pork Scratchings can be bought online here.

There are some also available from e-bay from the following sellers:
Rick's Scratchings - rick11254
Yorkshire Produce - yorkshire_produce

There are a few other on-line sources in the form of ex-pat food suppliers and low-carb product specialists