I found the website of a company that sells these and other specialised baking powders - Kudos Blends Ltd at http://www.kudosblends.co.uk/ - but they only supply in large quantities to industrial bakeries. It would be good if more bakeries decided to use potassium baking powder to make some low sodium baked scones, etc for the high proportion of their customers who would benefit from lower sodium intake. You'd be surprised how high in salt/sodium most scones are.
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Read my Mensa article on Obesity and the Salt ConnectionSodium in foods
See Children and Obesity
See also FAT RETENTION