Thanks for the information
It is on a bike I have repaired ( was told it ran before I bought it- had a seized motor , clutch was worn out etc.) I have rebuilt it. I put a brake wire/ switch on - works fine. I followed the wiring diagram I have , will make sure it is the same as this one. Last thing to do before registration.
Were you using a civilian or WD wiring diagram ? If you have run the wiring for the WD switch then it won't be correct. On the non-WD switch with no facility for stand-alone tail, the rear lamp wiring runs to position '5' rather than position '1'