hehe.... I have no idea, but you just made me want a chimichanga, too!

If there are any, I doubt they have chimichangas, or if they did, they wouldn't be nearly as good. You are far better off making them yourself! It's really just a deep-fried burrito! I might try that actually, just make some big burritos, pin them up with toothpicks, and deep-fry them. mmmmm......
I don't even think I want to try any Mexican places anywhere in the UK for fear of overwhelming disappointment....