ro_explorer thanks for that, yes I have that.
I have been able to remove the gear lever surround (22) which allows me to feel under the console, lots of strengthening webs on the underside! I was able to remove the trim around the cup holder and the mat below (16 & 17) which got me nowhere. I could not figure how to remove ( 14) which I hoped would provide the access I was hoping for. Ideally I would like to remove the console top? (8) but cannot see how this is fixed.
I suspect I shall have to mark out the location for the switch, bite the bullet and drill from the top and fish the cables through from below. I do need to be careful of the yellow interlock on the gear lever!