Revenge needs to find a reason to have him use his real accent, stat. It seems like it's the kind of show that could find an excuse. He has to go into the Witness Protection program, or he has an evil twin, or he gets bonked on the head and wakes up Cockney. Whatever, just do it!
I don't think I've gotten around to mentioning it here on the blog - I did tweet a bit on it, I recall - but I plowed through the first season of Revenge a few weeks ago and I am entirely hooked. Any fans?