To be fair to the 'kiddies', Curry's do sell mainly electrical goods and, to the best of my knowledge, there's no such thing as an electric pressure cooker. Basically, it's only a saucepan with a tight-fitting lid and a pressure-release valve. Curry's don't (as far as I know) sell saucepans, so why should they sell pressure cookers?
Because a pressure cooker is basically not much more than a 'special saucepan', there's probably very little difference (apart from size) to choose between them. The Argos range is here:
http://www.argos.co.uk/webapp/wcs/stores/servl et/Search?storeId=10001&catalogId=10001&langId =-1&searchTerms=pressure+cooker&go.x=15&go.y=1 3
I've also seen them in Tesco Extra.
I like your idea that shops should be compelled to sell 'what it says on the tin'. Staples already sell staples so, obviously, Curry's should sell curry. Sorry, I must stop typing here because I want to be first in the queue; I've just heard that there's a sale starting tomorrow at the Virgin megastore ;-)
Chris