Just be very careful with the interior light, i wired mine up to switch on interior leds when i first got the car, and if you look at the wiring loom diagrams you will see a black box that controls all the electronics (cant remember what its called) but it is only supposed to deal with the current of an interior light, and if too much current is drawn you will kill the box controlling central locking, and immobiliser and so on. So when i did it used a relay on the interior light to switch on a 12v feed to drive other relays. I would advise this when doing the "dutty mod" rather than just using the straight feed, as if you have the interior light on for a long time, it may do damage with heat!!