My local Sainsburys had the Reduced Salt one .... purple with orange lid.
It was on the specialist food section (with the gluten free foods, etc.). The other one is on both the specialist and the stock (Bisto etc) section.
It is like savoury flavoured water, but is quite tasty and certainly fills a gap between meals.
CD do a version for 3 times the price!
Amethyst: I shall try it with a bit of curry powder, that sounds nice.