Re: XF driving lights
The factory driving lights are very rare and expensive to buy at ford. They bolt up in the lower bumper either side of the number plate. If you look on the underside you will see two bolts that attach the plastic to the metal frame. There is a specific bracket that bolts across them. You will find it hard to locate the lights at the wreckers as most have been smashed.
My suggestion is to go to repco or Hella (they are in the Hella catalogue, also the grey protective covers) direct to get a set as they are the original manufacturers. The wiring to attach them into the main harness is located behind the headlights on both sides. You can also fit the factory switch which fits in the panel under the steering column.