Oddly, I'm rather glad I did. Turns out both rear lamps have blown. One has blown both filaments, one works only on the brake light. This left me with only the numberplate lamp for rear illumination. The copper that pulled me was OK about it, he seemed to adopt the attitude that shit happens, and its his job to inform me of a potentially dangerous situation and that I should rectify it ASAP. We went through the vehicle check, and all was well. Bike registered to me and all that. Bike taxed, good tyres, legal plate, legal exhaust. He asked me what the first thing I'd be doing in the morning was. My guess is he expected the answer of procuring a pair of rear lamps... Without thinking I replied 'Having a cigarette and scratching my testicles' He creased up and told me to piss off home, wishing me well as he did. No 'safety' camera would have picked up blown rear lamps and it might have been days before I noticed it. So, Mr.J.Random-Copper, whoever you were, err, thanks for pulling me over!