you have to phone and book an appointment. I think its worth the extra 200 just to get a same day decision. If you dont mind waiting for the answer, posting it and the time it takes doesnt mean that he's here illegally if its not decided before his visa runs out. It just means hes kinda in limbo. The no to phone for the appointment should either be on the application form or you'll get it on the website round about that. I'll dig it out if you need it 
