[Lord of Hog]

From memory the power supply to the lock just unclips (which you're going to have to do anyway in order to transfer your existing barrel assembly) and the number plate light panel just pops out and disconnects from the back. Make sure you make a note of how the wires are routed when you pull them through, including any grommets that will need replacing (since it's often easier just to cut old ones off and fit new ones). Nothing else electrical attached to the lid is there? When you fit the new one it's probably worth enlisting a second pair of hands to make sure it gets put on straight and then make sure the buffer rubbers are correctly adjusted so it releases nice and smoothly. Oh ... and remember to re-fit the lock barrel the right way round.