So i started on the valve cover
#DASTY :-D
"Like a beautiful woman, which made me suffer a bit before I could have it"
After looking for a while why the spitfire switch did not work i found this great page from a vitesse
https://vitessesteve.co.uk/LucasStuff/Triumph-2-speed-wiper-wiring.htm
and decided to try it on my spitfire custom wiring: