@WannaBeAYummyMummy Yes, agree with this.
@TJsAunt Mottingham does have some roads which are a bit rough looking but most of the roads nearest to the school, and which the kids pass to get to local buses aren't. Lots of kids use the local buses and have done for years. Not far from Mottingham is of course lovely Chislehurst, Bickley with Petts Wood beyond. A lovely area to live in. People rarely move away once they've been established here.
@TJsAunt Can I ask what your connection with the school is? Has something happen to you/your kids which has made you feel such animosity?
I don't think it's unusual for kids to be told if they're not up to the level of Sixth Form. Most (all?) Sixth Form Colleges have entry criteria so lots of kids move around at that point, not at all unusual - happens in comprehensives, grammars and other independents. It's just that the entry criteria for EC are so high (same as other academic schools).
Although mine are fortunately not in any of the key (GCSE/A-level) years, I've heard that the boys that have and will likely leave this year, are simply not academic enough or have been somewhat disruptive. I know parents in the GCSE year and these kids' parents were told ages ago and were recommended to look elsewhere for their boys as unlikely to make the grades.
I'm not sure why, but it does seem that quite a few of these have happened to be rugby players. Maybe all that testosterone? I'm guessing it will be similar in other schools with the difference that those schools have a formal entry exam when you move from junior to senior school, so they have the ability to sift kids out earlier.