You are ordinarily resident in the UK, so just put England.
But you can explain it further. For example, when I applied to do my Masters, I stated I lived in England and then to make it clear, I just listed each location and visa status for a time period (maybe the five years preceding to mark my Canadian departure - can't remember
).
So could you put:
BSc / BA (Hons) year - year
Location:
Status:
And so on, until it marks your US departure.
Does that make sense?
What are you applying for?
Sounds exciting! Good luck with your application.