Problem is..... the headlight & tail light have a different line of power, so they both have to be interupted with a switch. Not a major issue, but a bit more hassle.
I had a look tonite, and there is a small relay under the tank which the brown/blue h/light feed goes thru. The relay only activates the h/light once power from the alternator switches it on (when the engine starts).
So you can cut that one........
Next you need to cut the feed to the t/light which I found under the seat/tank where the plastic cover is (held by a 6mm bolt).
This only leave the front side light.....

May just remove the bulb
Cheers for the info s_ellinson

but I'm not sure how to translate it with Google
As its now winter in UK, I may not bother until next year