You are quite right [mention]geofferz[/mention] Found what I was looking for in an old 2009 MCN article- Can you use flashing cycle lights on a motorcycle? Some riders are starting to use flashing bicycle lights in addition to their normal dipped beam when they are riding through heavy traffic. The trouble is that it is illegal under the Road Vehicle Lighting Regulations 1989 which say that lamps on motor vehicles have to show a steady light, unless it's an indicator, emergency vehicle headlamp, a warning beacon or special warning lamp fitted to a Police vehicle. However if you clip or tape the lights to your clothing, then they aren't vehicle-mounted and aren't subject to the lighting regulations... This is the article link just for reference, its says exactly the same as above. https://www.google.co.uk/amp/s/www.motorcyclenews.com/amp/new-rider/choosing-kit/2009/december/dec1809-flashing-lights-on-a-motorcycle-/