An unconditional is only given by medical schools, other than some historical or very unusual circumstances, to applicants with achieved A-Level grades that meet the minimum requirements of the school, whom have been successful at interview. Effectively you have been given a place, and the place is conditional on you achieving AAA or whatever, but since you already have AAA you are given an unconditional - you have no conditions to entry. It isn't some kind of secret free-entry pass or something, you still need to do well at interview, UKCAT and all that jazz; it's just that you already have your results.