Not even the rain could stop me.
As promised, here's a couple of photos of my now fully fitted and functional reverse parking camera!
Just above the rear license plate
From the SatNav screen
Fortunately, with the car being NHB, the camera is quite easy to miss, unless you look for it, of course.
All in all, the mod cost me way under £20, including overseas delivery for the camera and all the other bits. It would have been nice to have a unit which was simply plug and play, but I have found no such items readily available for european Civics. (Unless you want to spend hundreds on the Honda solution).
Coupled with the rear parking sensors, parking should now be a doddle!