Top 3 newcomer first posts:
1. Has anyone retrofitted Range Rover Sport or MKIII headlights to their P38?
2. Has anyone put a winch on the truck?
3. Is there a commercially available snorkel?
This is an 8+ year old vehicle. It is a niche luxury vehicle at that. They stopped carrying most of the factory accessories in the dealers long ago. I am sure a limited number were produced to begin with due to cost and demand.
Your best bet is to source out a used factory winch bracket (good luck :lol: ) if your goal is to maintain the original bumper with as little fabrication as possible. Aside from that there a few folks that produce aftermarket bumpers with winch brackets (a bulkier heavy off-road look) - or you could custom fabricate something to sit behind the factory bumper. A gentleman on the boards successfully fabricated a hidden winch mount behind the factory bumper. The pictures are floating around here somewhere. I have also seen the removable winch set up, taking advantage of a hitch mount. This would require fabricating a 2" hitch and welding it to the frame in the front of the car, however. Your options are largely contingent on the look you are going for and the desired use. As for the snorkel - the short answer is no. You might be able to modify a snorkel for one of the models though.
Unfortunately there are very few mass-produced accessories. You have to remember this truck fetched a price tag of around 70 grand USD towards the end of its run. Mainstream companies targeted the RR Classic and Discovery for most of the big ticket items like snorkels and winch bumpers. I doubt there was ever a big enough market for major off-road accessories for the P38. Maybe now that time has passed and the prices have plummeted, companies might provide more options but I doubt it.