aftab, I don't think they will invite you to Jerez if your scores are not good enough. If you apply for self sponsored then they will either use the scores you had at phase 3 and invite you over for interview and debrief - meaning you have passed the tests and they are judging you on the interview in jerez, or they will revert back to the usual self sponsored selection and invite you over to do the tests and the interview and take it from there.
Lol i have no idea what they do with the copies! Given I met the academic requirements to get to phase2 about 5 times, you'd think that would be good enough for self sponsored! Maybe its data protection or something...