i actually have no issues with the leads (carey mulligan, keira knightley, andrew garfield), and i'm not familiar enough with british actors to suggest replacements. but it was mentioned that the characters were cloned from the people at the bottom of the societal ladder ("junkies, prostitutes, winos, tramps"), and the leads look way more like they were cloned from runway models. it's a small gripe. i did picture them all as plainer from the beginning though. i saw tommy as pudgy for some reason. maybe because he was kid all the other kids teased. small gripe. people don't pay to see movies about plain-looking people, i get it.