Generally speaking, black smoke is fuel; blue/grey smoke is oil; and white smoke
is water. Heavy white smoke is trans fluid. On a Range Rover it can only be water. The bad news is you have a blown head gasket or worse, depending on the year. if your Rover is 4.0/4.6 you could also have a slipped sleave in your engine block. This is common on higher millage engines, but I have seen it as early as 55k miles. Perform a block test to verify. Also remove the center 2 spark plugs on each side and check for pink/orange discoloration that looks like coolant.
Could be a bad head gasket and/or a cracked head.
He drives a white Range Rover Sport with Ranger on the grill instead of Range Rover
White Range rover
White Range rover
White smoke normally means you are burning oil.
oil getting by the rings causes white smoke and oil dripping out of the tailpipe.
white smoke can be either your car overheating, or smoke from an electrical issue
White smoke means head gasket, cracked head or equivelant.
water
blown headgasket
blue smoke is oil. white smoke is water. black smoke is unburnt fuel
Quality of fuel plays major role in smoke emission