By introducing some selection based on the results of a test. The move comes as ministers seek to lift the ban on new Grammar Schools. 0ur education editor, Bra Nwen Jeffreys reports from the unions annual conference in cardiff. Grammar schools have a long history. In altrincham, 100 years of tradition. Then, almost 20 years ago, new Grammar Schools were banned. Now, some comprehensives Offera Grammarstream for many, a way of stretching the brightest. But could this also be used to get around the law . So today, a warning of legal action. They fear ministers could encourage more of this. The schools where wed have an issue around this is a school thats advertising a grammar stream, that is putting children through tests for it, and where we get the sense from documents and other things that children stay in that stream, that its actually a selective system that is being introduced. Thats what we would want to challenge. Is this essentially a Shot Across The Bow of the government, to sa