With a thin screwdriver prize off the small sidepanels which click out. Then with a star screwdriver undo the 4 screws holding in the main panel that lights up.
At the back you'll see 3 white square'ish peg type things. These are the bulb holsters. Undo these as you would a bayonett bulb in your house and out will come the holder with the bulb in it. Ensure you take this whole white holster and bulb in to the motor factor as there are over 200 of these types of bulb and the white holder will help them identify which ones you have.
It's very easy and simple to re-install. Job done and a saving of £60!
JR Naylor, August 2010