I know, it is frustrating. Unfortunately, UK and US admission cycles do not work on the same time scale... But as more and more UK students are likely to apply to US universities after the changes in Higher Education funding, it might be in the UK's interest to catch up with the earlier US decision dates (i know a couple of people who ended up accepting the US offers simply because it would have been too risky to decline them without firm admissions and funding (!) offers from UK unis)...
Anyway, good luck!