What do you need to get into mi6?

Well normally you get headhunted as by the name it is a secret service. But i am not sure about today but you can send an application but you have to meet a very long list of criteria to even be considered of an interview. I think your best bet is learn a foreign language, Arabic, Russian, and Mandarin are very hot in their eyes along with dedication to the U.K. So possibly serving in the military for a few years or in some government position shows loyalty. But the rest is mainly steer out of trouble don't get involved in dodgy activity have a good bank record and you never know!