Graham, the 'rider' in question was not behind me long enough to be considered on my tail, but as we came into a village I was braking moderately for the 30mph limit and I don't think he had that in his plans! He gained on me rather quickly and took avoiding action whilst sharing an 'inpolite gesture'. He explained himself in equally forceful terms shortly afterwards as we both pulled up at a pelican crossing. In truth it seems that the brake light switch isn't fully functional on the Mog, and as an ex-biker I can see both points of view...