"It's not a case of policing or enforcing this policy at Springs Academy, we are simply encouraging it among the students," -is the quote from the school Gromit.
The term 'ban' was used by the newspaper, and does not reflect the school's ethos, or its implementation of it.
I entirely agree with the school's approach, which is not to 'ban' slang, but to ensure that pupils not only know the appropriate venues for the use of proper English, but what proper English actually is.
Part of living in the adult world is assimilating the need to use langaue appropriate to your surroundings and the people you encounter. I work with telephone engineers and perfectly happily use short sharp words to descibe malfunctioning equipment that i would not dream of using to my wife or children.
The essential thrust of the point is knowing about time and place for the use of langauge, which is not connected in any way with trying to prevent students from expressing themselves in their own idiom among their peers.
Any school that educates its studnets in the differences in language application, and encourages them to know correct English for the times it is necessary to use it, is to be encouraged.
The addition of words like 'cad' is simply added on to spin the piece towards making the school staff look like Dickensian martinets, which is to patently miss the entire point.