I live in the country, so we don't have pavements. However, on country lanes, you walk on the opposite side from the traffic -- i.e., the right. That way, you're always facing oncoming traffic on your side and won't get unpleasantly surprised. Same rule applies in the U.S., except obviously over there you'd walk on the left. I don't know what the rules are when pavements exist, though. I haven't seen one in ages!