In article >, lid
says...
> Where can one buy food grade cornstarch &
> calcium phosphate?
>
> Cream of Tartar
>

any supermarket, here; in the baking dept.

http://www.mysupermarket.co.uk/asda-compare-
prices/Home_Baking/Dr_Oetker_Cream_of_Tartar_30g.html

30 g costs about £1 sterling

Janet UK