So if I'm reading this correctly, you want to study for two years in the UK then two years in the US. Since the comments here are fairly California centric, I thought I'd thrown in a Floridian's opinion. There are good schools in Florida, and some of the smaller ones offer okay tuition rates for 'out of state' students (which you would likely be classified as) while still having good business schools. Admittedly, two of the better ranked state schools, UF and FSU are somewhat inland, a bit of a drive from the beach. All I can say is research research research! Don't rely entirely on school rankings or websites, consider what real world experience and business partnerships they offer along with membership in professional organizations and outside accreditation.
Perhaps more important is the issue of credit transfer, which may be determined on case by case basis for each university. Again, this means you get research universities to see which gives you more credit towards degree completion as many may try to match course for course.
Don't forget about funding options as well! You may find that completing your entire degree in the US will make you eligible to compete for more scholarships. Or, the other option, that I strongly recommend looking at is finding a UK/EU university that includes study abroad in its program. Why not skip the gap year, complete your undergraduate study in the UK, then do a masters degree (likely two years full time) in the US?
If you have questions about where to look in Florida, feel free to ask.