UEA v. Nottingham

I got accepted to MA in Modern History programs at Nottingham, Durham, and UEA, and decided to accept at Nottingham.  I've already made my housing deposit, qualified for a Stafford loan, etc., and on Friday I got a letter from UEA saying that I'm ranked first on their list of US applicants to recieve funding.  So I guess I'm trying to find out the pros and cons of each school and ask if anyone knows how difficult it is to change my loan to a different school.     Thanks!