Here are the pics of my Road Angel Compact installation.
The first pic shows the male end of the multi-pin connector (from Maplins) poking through the plastic trim and bonded from the underside (this replaces the large and unsightly mounting bracket supplied with the Road Angel). A male USB lead is soldered to the back of this connector which then plugs into a 'cigarette lighter' USB power adapter hidden in the dashboard which is hard wired to the dashboard fuse box. Most electrical gadgets these days run off 5volts so this is why I have used the USB power adapter as this converts the cars 12v to 5v.

This pic shows the female end of the multi-pin connector which I have fitted to the base of the Road Angel and is internally wired to the circuit board to provide the power.

Pics of the Road Angel attached to the dashboard mount and ready to use:

This has worked out a lot better than I expected, it’s very easy to attached/detach the RA and is the perfect location to use the GPS speed readout as a heads-up display without having to take your eyes off the road.