Cheers for the comments, comrades. I think I might invest in a mid-range one, if I can finds me a way of tucking the wire away nicely. That loggerheaded six-toed felching COCKSPANGLE who cut me up this week has given me the little nudge I need.
I'm kicking around the idea of getting one. I've thought about doing it a few times but never quite got round to it. Then the other day I was westbound on the inside lane of the Old Shoreham Road near Benfield, and some utter NIMROD cut right across me from the outside lane, jammed on his brakes...