the "sugar" in most UK sodas/fizzy drinks is often derived from corn sugars and heavily supplemented with artificial sweeteners. I'd choose cane sugars every time in preference to corn (though I am biased as corn really messes up my gut). Its also extremely hard to find fizzy drinks without the artificial sweeteners in them - even the non-diet ones. Its not just the sugars though. In general sweetened and flavoured fizzy drinks have way too much bad stuff in them, and are best left alone. I do succumb though, and make a rule not to have any of the mainstream ones and just stick with organic drinks (like the fairtrade ubuntu ones or phoenix, etc) as they have much more basic and nicer ingredients. My current practice is to buy two cans of fairtrade ubuntu cola a week and thats my limit. Another option is to buy sparkling water and add either a squeeze of lemon, or a bit of pure fruit juice or concentrated fruit juice to it.