Mel
If you check here
camden.gov.uk/ccm/navigation/education/camden-schools/schools-admissions/
I looked randomly at St George the Martyr (a faith school)
1 Looked after children and previously looked after children.
Previously looked after children are those who were looked
after, but ceased to be so because they were adopted (or
became subject to a residence order or special
guardianship order).
2 Children either of whose parents is a committed Christian
attending either the Church of St George the Martyr,
Queen Square, or Holy Cross, Cromer Street .
Applicants should provide written evidence of their
attendance with the application form this should be a letter
from the minister of the church or equivalent.
3 Children either of whose parents is a committed Christian
attending a church which is a constituent member of
Churches Together in Britain & Ireland, & the Evangelical
Alliance .
Applicants should provide written evidence of their
attendance with the application form this should be a letter
from the minister of the church or equivalent.
4 Children with a brother or sister currently at the school
who will still be attending the school when the applicant
starts school.
If you don't meet Criteria 2 or 3 then siblings are 4th on the priority list.
Even if you meet criteria 3, children whose parents worship in the designated parishes have priority so you may not meet that criteria if you move away.
So bear in mind that faith schools can override the general borough rules.