As per Simon , the fuel pump relay is the most likely culprit.
One way to check it is to listen for the pump "whirring" as it build up pressure in the fuel rail, and once done it will cut out , and the speedo needle will give a small "kick" . Once this is complete the car should fire.
Pull the steering column down to its lowest position, drop the dashboard and you should then see the 4 relays screwed to the bulkhead. From my (very fallible) memory it is the unit with a purple and black wire? They are standard Rover units and readily available from Land Rover specialists . Whilst sourcing one it is a good idea to get another as they can (and do) fail at the most inopportune times so a spare is well worthwhile. If you need to use the car before you can source a new relay I am told that you can remove the relay which is used for the immobiliser circuit to replace it , the immobiliser won't work of course, but it should indicate that this is indeed the source fo the problem.
Good luck
