On my XS the safety relay had been altered by changing the wiring connections rendering it inop.Gentlemen, once again Thank You to all for your help on this!
It is much clearer to me now what the starter circuit and starter relay need. The wiring I had to start with had been modified and I've changed it a lot more so I was feeling a bit out on my own. But Rasputin, yes the white wire from BB was to the coil mount not the spade connector.
The black ground from the other coil mount used to go to a horrible mess of soldered (soddered?) black wires which I have replaced with bullet connected wiring from most of the earths on my diagram (not the neutral switch which grounds straight into the engine) and led to two ring terminals at the head steady, so there is still a connection from the head steady to the coil mount. Not too sure that all is correct, but . . .
Pete, I will take the safety relay off today so will have a wee look inside and clean it. I need to join a new wire from the kill switch to give a power feed as Jim suggests. Quite probable that's why the starter motor is inert.
Jim, I will open up the l/h switch cluster and check the earth wire which I think is the one connected to the headlamp bulb. Will check if/how this routes to earth.
And Pete, thank you for
Need a bit of encouragement sometimes.
I delved into it removing the cover, it was full of rusty dust, I cleaned it all out and cleaned up the points, put the wiring back as it should be and it worked as it should.