Article 6 enshrines everyone’s tight to a fair trial, including a public hearing, before an independent and impartial tribunal within reasonable time. The article also enshrines the presumption of innocence and other minimum rights for those charged with a criminal offence, such as adequate time and facilities to prepare their defence, access to legal representation, right to examine witnesses against them or have them examined and the right to the free assistance of an interpreter.
Of course this has already happened with the introduction of the Justice and Security Act 2013 which means that you can be charged, tried, convicted and sentenced without knowing of any of the details of the case against you. You will not hear any of the charges against you. You will not get to know any of the evidence against you. You will not be allowed to be present in the court which decides your fate. You will not even hear what your sentence is. The first thing that you will know will be the police coming to your door to arrest you and place you in prison to serve your sentence.
This legislation is in direct contradiction to Article 6, which is probably why the Tories want to get rid of the Human Rights Act so they can chuck whoever they please into prison.