The tie breaker for STRS is distance. If you check out the STRS website it is in the admission section. Would add the link but I'm not very good at getting them to work:-)
Just to emphasise, ranking is first worked out on weighted scores, then the distance factor is applied for those with equal weighted scores to give the ranking. It is only likely to affect a small handfull of children.
And if you think that's complicated, you should see the admissions criteria for some faith schools, where there may be 10 or more categories (Active membership of this faith in this parish curently at a faith school, Active membership of this faith outside this parish curently at a faith school, Active membership of this faith in another parish not at a faith school, Another faith within this parish, and so it goes on, until, at the bottom of the list, child with no siblings, no faith and living outside the parish). I feel sorry for the average parent trying to negotiate that minefield, but at the same time can see why those schools have such a complex set of criteria.