Apologies for not posting this sooner. My local Home Bargains (Cramlington) keep filling the shelves with these. I was convinced that when I bought 5 packs a fortnight ago that would be it..................but they keep coming! I know they are in stock in at least 1 other Home Bargains locally, and the shop manager reckoned they were available nationwide.
What you are getting is 8 triple blades for £1.99 and they have also been doing the razor/handle with 2x replacement blades for £1.99, although these have been shifting a bit faster.
Admitedly they aren't 4 blade, vibrating, whistle and bells affairs, but they do a heck of a job for the price.