Can I transfer from a top UK university to a US college? What are my chances of getting in?

Considering the cost of a US education is important: do your parents have 200.000£ for your education?
If so, there are universities in the US that’ll allow you to apply as a freshman if you enrolled part time and have fewer than X credits attempted (and all attempted are passed). In fact there are even universities right now that’ll let you apply for Fall 2020.

If they don’t, most US universities do t fifer aid to transfers so you’re out of luck if you start anywhere.

You can also contact Scottish universities and see if they have a place in your chosen subject: in Scotland, you’ll often have 1-2 mandatory subjects and 1-2 entirely up to you.