Well, I never real thought of having a whole country to fight over a plate instead of 50 different states. Of course the less densely populated states make it easier to get the plate you want. You are given three choices in order, one can see if they are available first, submit, pay $25 for initial plate fee then $10 a year after w/ no yearly registration due to the year of the car (talking about the coupe here). It is a "PERMANENT" plate with permanent registration like a trailer. You basically can keep it for life and switch vehicles but if I switch to a newer car, first off it wouldn't make sense because it wouldn't be an E9, but I would then need to pay for the registration again. I never knew cars could have permanent registration until I moved here. Next year I think, or it already passed law, that cars that still require registration (newer cars/trucks), they are getting rid of the pesky "mo/yr" expiration stickers.
I was able to get my first choice
E9COUPE with no issue. I don't want to sound like I am rubbing it in, that is not my intention, but just to show the contrast. Another question was when you say UK. Is that all of the UK; Northern Ireland, Wales, and Scotland as well, or just England and the other countries have different sets of plates?
I get the low number thing. Here in ID, we own the plates for life and can do the same thing if sold, I believe I could sell to someone and they would then be able to transfer them in their name, not sure how that works, I've just kept all of them over the years, hanging in garage etc. But people that have 1, 2 or very low numbers/letters mean they have lived in Idaho for a long time (typically, unless they bought them as well), which are pretty coveted. I've seen a couple with just one or 2 numbers but it's pretty rare. Once I saw two in one day but it was a car weekend. In the UK, it seems more like a "status symbol" at the prices you pay and not just a "vanity plate" as they are called here. Suffice to say, I can see the demand for your plate, but like you are saying, it will take a special person to want to pay that kind of $$$ for a plate, obviously with deep pockets...still WOW!

Might as well start high, can always go lower as we all know. Curious how this turns out for you, keep us posted, good luck.