It will run like a bucket of bolts but as long as you don't drive it too far it will survive. One of "my beloved customers" filled up an old 2.5 naturally asthmatic diesel Defender with petrol a few years back, drove it around for about four days and then bought it in because "it was smoking a bit and would only do 25mph". New set of injector nozzles, filter and a good clean through the fuel system and it was as good as new!
It is not uncommon in some parts of the world to thin diesel with 5 or 10% kerosene in cold temps, but you shouldn't thin it too much as the injector pump relies on the oiliness of diesel for internal lubrication and a "dry" fuel will cause massive internal wear and eventual failure.
Don't even think of putting petrol in a modern common rail diesel engine because the high pressure pumps really don't like it much. I believe LR insist on replacing EVERYTHING in the fuel system if somebody does it on a new vehicle now, or no warranty at all on the engine.
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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