So I'm going to be travelling to London in September, and I'm planning on taking my new Macbook with me (primarily the reason I got it). I've been trying to figure out the power resources, will any plain converter work? If I plug my Macbook power into a generic converter will it be ok? Or should I go to the Apple store once I get to London and pick up a power source there? Are the wattages different from the US to England? I don't want to end up frying my Macbook.