Thanks TB. Just one question before I start, well 2 actually......
1. You say I need to connect 4 wires, but the guide only has 3 - I assume the 4th is the green/pink wire in pin 4 that connects to the courtesy light? Why?
2. Is there any benefit in connecting pin 3 to disable the dimming for reverse?
1. I think this stops the mirror dimming when you turn the light on (I'm not going to bother)
2. Again I'm not going to bother with this connection as I never look in the interior mirror whilst reversing.
So for us it just needs 12v and earth 
That will work.
Trouble is, Mrs Chopsdad, or Chops herself, would be able to use that mirror at night to apply makeup 
The reverse is useful - never connected it on my MV6, but it was on the Tractor. Next time I have any of it apart, I'd run the cable...
I have lights in the visors for my make up applications anyway but I'll have a look at the reverse connection before I click it all in place 
To be honest, the courtesy one is so easy, may as well do it 
OMG How easy was that to do!
TB It may be worth adding to the guide that in a facelift all the coloured wires match up with their counterparts from the interior light.
Ie. Brown from the mirror connector - brown on the interior light.
Black joins with black switch wire (not permanent live - red)
Grey/black - to grey/black switch wire for the courtesy lamp on.
There are 2 blacks coming from the mirror - choose the one connected to pin 2 per your guide.
And if you need to reverse when the mirror is dimmed - just pop on the courtesy light and hey presto it's back to normal.
