How about a personalised Max and Paddy style alarm?

YouTube - Phoenix Nights "Get back u bastard I'll break ur legs"

Or a MechLock? It's totally mechanical so no electrickery bits to go wrong, which is quite likely in a Land Rover which is driven through water/mud/crud regularly. It's an Italian invention and it's been around since 1989 and they claim not to have had a single claim(I'm getting all this shpiel out of LRW magazine...) It's basically a valve in the clutch system which locks the clutch open so the gearbox is isolated from teh engine. You just lock it on and off with a seperate key.
 

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