Has searched some information:
At the moment all universities in England can only charge a fixed amount for tuition. With Top up fee£ the university can legally charge as much as they want for the courses they offer. It is estimated that the average cost of would be about £5000 a year; five times what we are currently paying. However, the universities are allowed to charge less or more, depending on the reputation of the university and the course.
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Okay, I've made misunderstanding... but now got clarified.