As for Stevia, try any you can find at a vitamin/supplement Online store that ships to the UK! :) There might be recommendations in the Stevia forum. I have yet to buy Stevia on its lonesome - it's included in my teas that are already pre-packaged. For my other Sugar needs I tend to stick to Brown Rice Syrup and Fructose, the natural fruit Sugar which you can buy in a crystaline form much like table sugar, which my health food store sells.