Hi James! wish I know what exactly the reason of her why she had to go for an interview when all i know that if u are applying for a visit visa only an interview be done after your application has been dispatched for process then they will call those applicants who have not met their sponsor in person yet to know how much they know their sponsor. If u already met in person then it would be less a problem unless they ask u for more documents, that's why I hope I know exactly the reason coz my close friend applied last May 2011 and was refused so she just answered and supplied all the necessary documents asked or mentioned in her refusal letter then reapplied last august, after 10 days she was granted a visit visa. Now she is already in UK with her bf. I knew exactly what she did maybe then u could try again and see if it works for u. Good luck