Today with the help of my buddy Andy Linton (thanks andy) we managed to work out the complex hazard warning switch with its multiple wires.
Once again an old type Bakelite switch similar to the ones Noah used on the Ark.
It was the last one to sort out, so now all the dash switches are working and looking good.
Heater controls next, then that's the dash finished.
Here is the offending switch:
And here is its replacement, (far right)
Update, heater controls fitted.