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The crankshaft position sensor is a common failure part on these vehicles, that, when they fail, exhibit the same symptoms as you are experiencing: crank no start until the engine and sensor have cooled off. You may do a search on this site to see how common a problem this. The sensor is on the left side of the engine, lower, where it mates with the transmission. I remember someone pouring ice cold water on the sensor to cool it down to allow the engine to restart.
I strongly suggest downloading the RAVE from
http://www.landroverresource.com/rave.zip It is the full-blown factory repair manual for your vehicle. Between this forum, and RAVE, you can keep your dealer visits far and few between.