http://www.spokes.org.uk/wordpress/wp-content/uploads/2009/09/spwkr09.12.28.pdf
Includes the wisdom of posters HERE!!
"DAZZLING BIKE LIGHTS ON SHARED PATHS
It's dangerous to be dazzled by undipped car headlights – so don't do the same when you are a cyclist! On shared paths we suggest.. 1. Align your lights slightly to your left 2. Tilt lights to shine about 5m in front of you"