If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
I went to that school back in olden days when it was a grammar. It hit rock bottom a few years ago but I can see from the local area that the behaviour outside of school has massively improved. I know a few people from the St Quintin's estate who applied there - more as a back up than anything else - but it it seems to be viewed again as a viable option.
The head of course got a damehood recently. I was once told that the three most important things in a school are the headteacher, the headteacher, the headteacher and that is true in my experience.