Lol, I actually don't mind chain restaurants - but that being said, fine dining in my hometown was Red Lobster and all it's fancy courses
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I guess not a whole lot of restaurant entrepreneurs want to brave 6+ months of hellish cold and snow! We're a meat and potatoes kinda place anyway.
My British husband also loves chains - he's a fan of the portion sizes! He's a skinny guy, but he likes to have hot, tasty food and a lot of it!
I agree that Italian restaurants in the UK are far superior to the ones where I've been in the States, and the pizza and Carbonara I've had here is amazing. However, my hubby and I have found the quality of restaurants varies so wildly that you have to either be adventurous (which, sadly, I'm not when it comes to food) or have a good friend's recommendation to test drive it. Especially pubs. At home, people went to the good places to eat and didn't eat at the others, so they went out of business! Only my experiences, though...
ETA: Apparently there is an "American Style" 50s diner near Swadlincote, Derbyshire. Never been, but here you go:
http://www.the50samericandiner.bravehost.com/ [nofollow] ETA: Wow, just actually LOOKED at the site - it's super cheesy!! Love it!