@TheAnnabelle. Stanford has different requirements for non-Canadian internationals and they have different requirements than other schools. Please read what I posted earlier in the thread. Since you are from UK you need to have submitted the CSS and International Student Certification Of Finances. If they needed anything else they would have let you know.
http://financialaid.stanford.edu/undergrad/apply/new.html
http://financialaid.stanford.edu/pdf/IntlCertFin16.pdf
If you have any further questions…please call the financial aid office for clarification.