Cheers Snowblind. Thanks for that, yes I suspecting that the sidelight were the issue from what I could remember from owning earlier E39's. I guess it would be a matter of soldering the aftermarket LED cable to the BMW sidelight cable. I did look on realoem, but the pictures did not give me a definitive answer; not like a real-life owner
I looked at LED's but they would not fit in place of my H7 bulb as they do not have a holder, so upgraded my halogen lamps with HORIZON LED 55W HID's last year and the difference is incredible.
They are an excellent company as well; lots of help and 2 year warranty; I don't get on with Chinese imports.
Thanks again.