I've done exactly the same with my TomTom .... you can hide it (power cord) in the seam all the way to the RHS Power outlet.
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Like this one ;)
http://www.aulro.com/afvb/communicat...m-into-d4.html
Yep, sorry I'd forgotten about yours Mark.
The Disco3 one also has a few hints around permanent wiring to a fuse piggyback but doesn't show the rear camera like yours.
So between the two posts you've got everything you need. :)
DISCO3.CO.UK - View topic - D4 left hand drive blackvue install guide
It's LHD too so you've got to reverse a few things.
Scott