Now got a Haynes manual and..................... Even though it mentions the fuses and what does what, none of them are for interior lights or central locking. Don't get me wrong, with a 15yr old motor I will need the manual at some point I have no doubt. lol Now wondering if it could be wires in either of the front doors leading from the locks instead after a lot more googling with ref to the central locking.... Doubt that will affect the interior lights though unless there wires have earthed as well against the scraped cables for central locking. BTW the int lights neither work with door/s open or by turning on at switch.