Thanks for the help anyway, its great to get help and I likewise always fear the worst. The lights have been in operation for six months now without problem but I knew there was this question in my mind that I needed answered. Happy new year.
Thanks for the reply, its not single cable, two core, but I think I may rewire soon. At the moment the lights only go on for five minutes at a time but could be a problem in the future if on for any length.