A sample letter that meets the UKBA's student visa requirements. All UK schools should use this sample to prepare documentation letters for US students.You do not need to provide financial evidence if: you're applying for permission to stay and you've been in the UK with a valid visa for at least 12 months. Example Loan Letter to be used in support of a Student Visa application. Public. Loan letters​​ The letter should be dated no more than six months before the date you submit your visa application. For a standard form of payoff letter, with integrated drafting tips and explanatory notes, see Standard Document, Payoff Letter.