On the bonnet slam panel - on a plate a bit like this one:

upload_2019-3-7_13-16-24.png
 
The code may appear as letters or numbers. They used both, it's a Rover/Land Rover thing.
Although there is a perfectly good part of the VIN plate (see above) for the code a few years LR couldn't be bothered to put it on.
In those cases you MIGHT be able to get the code from a franchised LR dealer's parts dept if you give them your reg or VIN number.
659 is one code for Bonatti Grey/Pewter Grey. Two names, same colour.
 

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