Speaking of Breaking Bad specifically, I think the culture and setting are far too integral to properly get remade. You can always do a direct export, like shows we get on BBCA, but I can't see it being successful outside of the American southwest.
Mad Men might be able to get its own version, but it would be vastly different. Obviously the series is highly dependent on US culture and issues of the 1960s, but that's not to say that you can't set something similar in London and focus on the cultural shifts happening in the UK.