Well, it's obvious what was going on here, the lights were stationary and the helicopter was inadvertently doing one of those manoeuvres where the nose describes a circle and the tail describes a bigger circle (my instructor demonstrated it to me a secret training place nr Wellesbourne and I concluded with my massive 60hrs that it was impossible for a normal mortal), now this helicopter had probably just passed low over Mar Pardoe's brewery in Quarry Bonk (Quarry Bank, Bonk is Black Country for Bank) and the fumes from the brewing vessels had entered the machine (through faulty ventilation ports) temporarily affecting the pilot. Whilst not suggesting alcohol played any part in this whatsoever I had a similar experince riding my push bike back from Mar Pardoe's last year when a lampost suddenly started swinging round in circles ..