It's all very puzzling. I've been using Tesco's own salt for many years but it was substituted for Saxa with the last home delivery order. It looks the same but is definitely saltier.
I'm afraid it's all in the mind barry1010. Salt is salt as PP said. Virtually all culinary salt in the UK comes from the huge Tata owned British Salt Works in Middlewich, Cheshire. It's a sight to behold by anyone who has been on the nearby canal.
// Table salt is finely ground with impurities removed and an anti-caking agent added. This gives it a smooth, fine texture. Because it is so highly processed, table salt has a slightly weaker flavor than other salts//sic
any reason why it would be in the mind, theprof? After all, barry wasn't expecting it to taste different, he was expecting it to taste the same. (Not that I'm offering alternative explanations.)