Further to the email regarding undertaking on the motorway, I personally have no problem with it. I do have a problem with the suicidal form of it I witnessed this week. I'm referring to motorcyclists overtaking between the lanes on an otherwise full motorway. If you are in the fast lane in particular, it really is difficult to see bikes approaching inside you. It only takes a small drift towards the lane markings to clip the bike and cause a lethal accident. No cyclist would survive coming off a bike at high speed on a road with all lanes occupied. You couldn’t avoid being run over by following cars. I am not sure if it is illegal, it should be. It must at least be covered by dangerous driving rules.