Fitting the fuel flap and catch is easy, fitting the cable and release leaver is a little more involved - it requires the interior out, time heavy but not particularly tricky. Mine is released from inside the boot. Which is a bit of a pain, but better than having a lock on the filler flap. The realese leaver fits to captive nuts welded to the inner sill, which are not present on my fairly early L spec, but you might be lucky and find that later production runs all had the captive nuts, or you might have to get inventive and use a self tapper and be a bit careful with how rough you are with the leaver. You'll want to get the boot release cables and catch when you get the fuel flap and catch. It's all operated from the same lever.