Del. Mine was hard wired at one point, but then I changed my setup. The 2005 cars have their ciggy sockets behind a wee flap and it was a pain having it always on show.
What I did originally was to just hardwire it into the back of the socket and then run the cable up and round the dash.
But now I have a 3 way splitter hard wired into the back of the socket, that's mounted in the passenger footwell, and then have the RA plugged directly into that with the wire again run along the top of the dash and down the side to keep it fairly hidden.
I believe ed has his wired up with the wire disappearing down behind his clock. He might have changed it though after his recent work.