I voted for Coca-Cola because that is the closest choice. I am soda addicted, so I usually have a particular type of cola for one or two weeks and then shift to another. Given a choice, I prefer Dr Pepper (don't know if you have that in UK). I usually buy those 24-packs from walmart and stack it in my refrigerator. I alternate between coke, pepsi and Dr pepper.

Diet versions are a strict no-no for me. They taste crap. Coke Zero is fine with me. Coke-Cherry is also okay, but I prefer the regular coke. And they must have caffeine. I usually don't have sprite/mountain dew, but when left with no cola drinks, I try them.