Construction and Use regulaions are not applied retrospectively and the regulations at this time refered to "during the hours of darkness" so ok during the day. A vehicle manufactured at that date should have a minmum of one centraly mounted Brake Light so you can argue the vehicle should have had this. Obviousy you can have poor visiabilty conditions even during the day so if the lack of lighting caused an accident they would no doubt take you to court for dangerous driving or similar. Indicators again were not required when built but if you cause an accident as a result of not indicating your intentions beware. You could have a Comander giving hand signals.