I agree that there is a general lack.of aspiration in the UK but I also think parents and schools are way too focused on traditional academic education and performance. From an early age in the UK there is a fixation with what reading level your child is on and very little emphasis on whether they actually enjoy reading and are reading books that they love, regardless of level.
My DS didn't enjoy learning to read. It was always a battle to get him to pick up a book. Until we moved to the US where he was introduced to such a wide range of books and where the focus was on pretty much reading whatever you want. It worked and he's read way more books than I ever thought possible.
While the US is definitely not known for its great schools, and standards vary widely in the public sector, there is a strong sense that àspiration is good and that, whatever your background, you can achieve a college education and get a job that pays well.
But, unlike the UK, schools offer a variety of subjects ar high school like philosophy, driver's Ed, all sorts of languages, and tons of sports which all count towards your final mark.
There is also a strong sense that just getting good grades is not enough , colleges want to know about leadership and community experience and sporting or other achievements outside of the classroom... it makes for a lot of variety of experiences and skills that are vital for the workplace. So while academics is important, I want my kids to learn so much more than that.. and most of all I want them to enjoy learning. I feel that many UK state schools focus on data, essentially, rather than on developing a love of learning and a curiosity about life, whether that's in traditional subjects or not.