All done now, thanks guys.
It was quite simple, about 3 hours.
The bumper remains in place for fitting the towbar itself (witter detachable swan neck), just the boot floor and LHS side panel requires removal for the oem Mazda dedicated wiring.
The most difficult part was channeling the two cables to the battery through the bulkhead.
The instruction were by picture only, so I sat & studied them first for a while.
There is no visable evidence of the towbar until of course you fit the swan neck and the 13 pin connector swings down into place.
I can take some photo's if anyone is interested.
Phil