There is a mount available from Land Rover for winch fitment on a RR Sport. They also do a snorkle.

I think the part number of the winch kit is VUB501471 (I also think it is the same as the Disco3 fitting)

Snorkle part number is I think ADL790020

http://www.rovercity.com/pictures/rrs/scan00144.jpg

Hope this helps.
Pete.

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Slightly Modified TD5 90

http://au.youtube.com/watch?v=LujYs1-a-JM