This was my take on the sodas in the UK and the US:
Just to give you an idea of what I would normally like to drink - when I'm at home (USA), I drink Pepsi products....mostly Mountain Dew, but I also like Pepsi. I can't drink Coke in the US unless it's watered down with ice. If it's Coke in a can or a bottle with no ice, I can't drink it straight. It's too sweet or something for me. So if I go to a restaurant or fast food place with Coke, it's ok because I just ask for plenty of ice.
When I'm in the UK, I like their version of Coke. To my taste buds, it resembles Pepsi in the USA, and my British husband who has tried Pepsi in the USA seems to agree with this as well. However, I think that maybe I'm probably one of the only Americans who finds this to be the case. I prefer Coke to Pepsi in the UK, but I can drink Pepsi if I go into Subway or KFC. Pepsi is definitely my second choice in the UK.
When Mountain Dew was produced here in the UK for a short time a few years ago (don't know if anyone remembers this or not), it was disgusting. I don't think any US Mountain Dew drinker would have liked it. They had removed the ingredients that were against EU regs and then the finished product tasted like medicinal Mountain Dew - like 3 parts MD and one part cough syrup or something. It was pretty vile and it died an agonising death. I wasn't surprised it didn't make it because it just wasn't enough like the real thing. They had to cut the caffeine content down because the EU considered it too high, but it was a couple of other things that were against EU regulations, such as sodium benzoate. I don't know why it resulted in MD tasting like medicine, but it was very sad. :\\\'(
Christine