Number plates which are worth a lot more than the cars they are on

I cannot believe this, I have gone out for a walk this afternoon several miles from my house and I’ve parked next to this! 91990
 
I’ve met the owners of the car now and they are very nice! They have a similar plate on their Rolls Royce. If this thread hadn’t existed, I’d neither have posted the original picture nor made their acquaintance. The Roller has secret compartments, apparently, but I didn’t ask them if they kept a pistol hidden in it.
 
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