50 minutes silent reading. That will look good for Ofsted. Some sort of discussion and feedback and assessment of understanding is needed. You could also use something that I frequently moan about - play a film clip of the chapter that you have been reading. And what about differentiation? Not all kids read at the same rate and have the same comprehension. Some kids have reading difficulties - well they're just going to love 50 minutes of silent reading- aren't they? I personally always read out loud to the class and then we discuss the text. You need to be discussing the meaning and technical terms used. English is one of the most important lessons on the curriculum. If these kids fail their GCSE they will be re-taking it ad infinitum. You owe it to them to teach them properly.