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I noticed today that I don't have the wheel nut key. I have no idea when this disappeared but that's another story.
I need a new one but am not sure which one is the correct one.
It's a 2012 model year XJ 3.0 diesel.
Well, at my shop if you came in and we did not have the universal adapters...you are SOL. They need to be drilled out and you need to buy a new lock kit. Just do not use lock kits, nobody steals rims anymore.
Most tire shops have special sockets to remove such nuts without a key.
Discard the nuts as recommended by Chaos, and use replacement standard nuts. BTW, if your wheel set uses chrome nuts, you can buy 20 chrome plated nuts from L.A. Wheel & Tire for $100, probably what JLR asks for 4 OE nuts. The OE style uses a cap over a regular lug nut, and they are easily deformed, particularly with 12-point sockets. They then stick in the socket and are generally a PITA.
Shops tend to not like keeping those universal keys on hand. They are all softer metal, wear quickly, and cost thousands and thousands for a complete kit. My shop is a JLR dealership, and we dont have a complete kit for that reason.
I agree with post #3 that you do not have a locki9ng lug nut. I have them and they are made by Mcgard. I've always ordered a spare to keep in my toolbox. But my Dealer also has a universal key.
In the USA, the 2012 XJ had a number of factory- and dealer-installed accessories. Locking wheel nuts were one (so were chrome or black nuts, BTW). Your owners manual shows the location of a wheel key, but your car may not have been equipped with this accessory. I agree with others that the photo you posted does not indicate the presence of locking wheel nuts.
It also looks like you avoided destroying that wheel, but I'd check it without a tire on a balancer for roundness and wobble before re-use.
Locking wheel nuts are no deterrent to a professional wheel thief. Armed with a cordless, high-torque impact wrench, the right size socket, and a small sledge hammer, he can pound that socket onto the locking nut and remove it in well under a minute. A team can remove all 4 wheels in under 10 minutes.
Save your money and don't buy locking nuts. Instead, make it impossible for thieves to steal your front wheels, which will probably convince them to find another target especially if they're looking for a set of staggered wheels.
How do you make it impossible for them to steal your front wheels? Simply turn your wheels fully towards the right or left when parked. With the front wheels angled in the wheel well, the car’s steering column lock makes it difficult for the thieves to turn the wheels forward enough to remove the wheel.
Of course, you can still use locking wheel nuts. Just know that they are easily defeated by a knowledgeable thief.