I guess if you've done internship in firms such as Goldman S.,JPM or MS UBS, and you're a finance major or econ. major from the top tier university national-wide, it would help
I heard one friend said average AT score @ LBS MiF's admits for 2009 so far is
around 710. Chinese and Indian are usually required to be higher than average
due to severe competition. It's better for you to retake in case you would like
to apply LBS's finance program.