Postgraduate Master's Loan and paying fees

Hi, I will start a course at Cranfield this autumn and I'll pay the tuition fee with the Postgraduate Master's Loan (I'm a UK applicant). In my acceptance letter, I read that Cranfield wants me to pay the tuition fee in full before the start of the course, but my loan will get paid to me in 3 instalments throughout the year, so I will not have all the funds available to pay Cranfield at once in September. What can be done in this case? I'm sure they know a lot of people will use the Postgraduate Master's Loan to fund the course, so I assume there will be people on my same situation.