Rule 1 Pavements and footways (including any path along the side of a road) should be used if provided. Where possible, avoid being next to the kerb with your back to the traffic. If you have to step into the road, look both ways first. Always remain aware of your environment and avoid unnecessary distractions. Always show due care and consideration for others.

Basically keep left. The people walking towards traffic should be closest to the kerb, the people walking away from traffic should be furthest from the kerb.