From our experience ( have been using ad-blue in trucks for getting on close to 10 years now maybe ), just buy the stuff, and make sure it's a known brand, in trucks it can cause $20,000 to $30,000 worth of damage to the system.
in a Land Rover it will probably be more .... ha ha
lots of shonky people have and are making ad-blue, we see them come and go in our industry, not worth risking a major failure, feel sorry for the poor transport industry that has no choice to purchase it in 1000 litre pods or 10,000 bulk tanks on a weekly or monthly basis to keep their trucks running down the highways.
Retail price is around $1-00 per litres, with the cheapest I have personally seen around $-50 cents a litre, average price most pay is around $-80 cents per litre.
so I won't be trying to cook it up in the back garden, really not worth for the small amounts that a car / 4WD based vehicles use.
Jack


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