My brother has recently bought an L+K Yeti, on a 65 Plate. it has puddle lights, but the passenger (NS) is not working and broken, does anyone know the part number? 

It might be worth checking if the bulb has blown. I replaced mine with LED along with internal cabin lights to make the car look a bit more modern and give brighter light. It's a fairly straightforward process to dismantle the wing mirror if you're careful.