Patsy33, the link you provided contains many falsehoods and should not be believed. Apart from anything else, if you live in the UK, the ingredients list is totally different from the photograph shown on the website. Distilled vinegar is NOT made from genetically modified corn in the UK simply because the crop can be considered to not exist here.
Salt is salt no matter where it comes from. You can pay through the nose for it in Harrods Food Hall or buy it in Poundland @ two for a pound. It's all exactly the same. There is no such thing as "the cheapest salt".