I was trying to provide accurate information for other applicants in the same situation. I have looked further into differing league table positions, and I think that applicants from the US should be aware that the Complete University Guide is actually owned by the Hot Courses Group, a private company. The rankings in the Guardian may be more reliable, but they are based on subjective student surveys, which do not necessarily reflect how a university will be viewed internationally for graduate school, employment etc. Of course, from any accredited university you can get into a top ranked graduate school with good enough test scores etc, but Americans should be aware that domestic rankings do not necessarily correlate with international rankings, and may be based on a different methodology.