Ok folks I'll answer seriatim:
Togo, table salt is indeed finely ground and contains added sodium hexacyanoferrate (II) (E535)also known as potassium ferrocyanide as an anti-caking agent. The addition of the latter chemical does not alter or weaken the saltiness of salt because 1) Potassium ferrocyanide is virtually tasteless and 2) the quantity used per Kg of culinary salt is legally limited to a miniscule amount per Kg. Table salt is not highly processed in any sense of the phrase. PDV salt manufacture (the type you sprinkle on your food) is made with one of the least methods of processing that exists. The claim that it tastes "weaker" due to any processing is quite frankly rubbish. The salt still contains approximately 39% sodium (the part that gives it its saltiness) no matter what you do with it and the sodium content remains precisely the same for culinary salt no matter if you buy Tesco, Sainsbury's or Saxa salt.
jno, let's be honest about this and agree that if we pay a premium price for a food product, we expect it to be of better quality and taste better than a supermarkets own brand. We all do it. I expect Heinz Baked Beans to taste better than Lidl Beans. Currently, a drum of Saxa salt is slightly over a pound in most shops: a week ago, a plastic drum of about the same weight in a budget supermarket I visited was £0.17. Both contain just salt and the anti-caking agent and are manufactured at the same site in most cases. Brainwashing us into thinking that one product is superior to another based on price has been the name of the game in the food industry for years via advertising etc. We expect Saxa to taste better, so for many, it does just that. It is all in the mind.