http://en.wikipedia.org/wiki/Road_signs_in_the_United_Kingdom

http://www.smartdriving.co.uk/road_signs/index.htm

http://www.bcvr.co.uk/guide-to-driving/roadsigns/index.htm

http://www.myroadsign.com/labels/UK%20road%20signs.html

http://www.road-safety-sign.com/

http://www.webtaxi.com/road-signs.htm

http://www.signplas.co.uk/road_signs.htm

http://jguk.org/2008/05/uk-road-signs.html

http://www.bcvr.co.uk/guide-to-driving/roadsigns/orders.htm

http://youtube.com/watch?v=Ju1YSFVBHZ0