The main beam on my 54 plate Mk1 Focus have failed. Everything else appears fine (High beam, side lights, fog lights).

I suspect that as both lights have failed at the sdame time that it's not the bulbs themselves, however what are the other options?

Could it be a blown fuse, if so how could I tell. I've looked in the fuse box under the bonnet but there doesn't appear to be anything obvious (would I blown fuse be obvious?). Also any idea which fuse it would be, as I don't have a fuse box diagram.

Thanks