Nice car. As Rick said, tire sizes need to change to accent the car a bit more. Looks like a 225/70-15 on front on a 15x7 rim. Since original size
was a 15x8 rim, the 7 looks a bit narrow. However, since these types of rims are from long ago, changing to a 15x8 would not be easy. Drop to a 225/60-15 or 235/60-15 on the next set of tires.
The 15x10 on back is good, but looks like you may have a 235/70-15 on back. A 10 inch rim screams for a minimum 255/60-15 and maybe a bit wider.
I do like the painted insert of the slots. I thought that kind of personalizes the wheels to the car.
I never did like the silver side louvers either, always thinking they were "unfinished", however, this is a very period touch to the car, as many did just that. They also chromed the wiper grill, sometimes the wiper door (very bad for driving - sun shines in your eyes), and the grills on the rear deck.
Eldon Hall, is that Cookham? South of High Wycombe? There is an interesting ghost story from there.
Now to your question, number plates. In the States, these are issued by each state after paying the registration and/or tax fee each year. At the time of this car, they were typically issued new each year. So the old ones would be taken off and discarded for the new ones. There was nothing special about the number, just a sequence of numbers from the office issuing the plate. In the mid '70s, people began more interest in personalized plate numbers and so many would issue the owner's initials at no cost, if ordered in advanced. Picking up at an office got whatever was the next on the stack. In the late '70s/early '80s, states discovered the money they could save with multiple year plates, so they began issuing plates that would be replaced every 5 years or so instead of yearly. You still paid a fee every year, though, and received a sticker for the corner to indicate the year.
None of this is like England, where the plate stays with the car.
In effect, the original license plates are equivalent to a metal version of an MOT sticker. Do you have an original MOT for a 30 year old car?
Now many states have discovered people will pay a lot of money for a personalized plate and they often have a couple dozen variety to chose from, usually one for each state university, ones for ecology, environment, special events, and so on. Once you would see a license plate from Nebraska or Ohio or Florida (good grief, Florida has a different one for everyone living there, it seems!), and they were readily identified to that state. Now, there are dozens for each state, and no one knows where they are from until you read it thoroughly to find the state name somewhere on it.
A lot more than you probably wanted, and of course not what you wanted, but odds of the original license plate is like hitting the lottery.

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