Tesla automated driving options compared?

[M030ef00]

I am just about to order a model 3 performance. What is the story with the different automated driving options? It seems as if the automated driving is purely a software option so I presume whether I specify it or not when I buy it doesn't matter? How much does it cost and is it the same if you activate it once you bought the car? How did the various levels compare? £9,000 seems a hell of a lot to pay just to get your car to stop at a red light in town. I take it that summon doesn't actually work in the UK anyway and I've heard some people say that auto park doesn't either. I'm probably looking at doing a lot of trips from the Midlands to Newcastle possibly as often as twice a week, if I'm doing that is it worth getting these higher levels of auto driving? How does the auto driving compare with the systems by other manufacturers? Is the basic Tesla system really not much of an advance on adaptive cruise control?
Sorry for so many questions but I've read it a few times and I don't really see what you're paying the money for.
Many thanks