Name change as I work in Education locally.
I would suggest you do look at the other local schools, possibly Ravensbourne too.
The behaviour of students at BJ is an issue, there is an issue with bullying and I am aware of numerous children who have moved away from the school for that reason. I appreciate that there will be bullying in all schools, it is how the school deals with it that is an issue. I think the previous poster's use of the work 'bustling' is definitely education speak!
Last term, Bromley jobs website had over 10 teaching posts advertised for BJ.
It is the only local school that staff from our department dread going to.
As pp said, as it is a faith school, CofE primarys throughout the borough are feeder schools. This means many of the pupils have travelled from as far away as Downham. This means friends are often not local. Also, if you look at the leaver's destinations from local primary schools, BJ seldom features. Last year, not a single one of the Year 6s from one of the local primarys went there.
Bromley secondary schools are notoriously oversubscribed so I would ask yourself why BJ has spaces.