It's whatever your school charges you. Edexcel is now providing them to schools for free, OCR charges about £11 and AQA nearer £13. Although in principle Edexcel providing scripts for free must be a good thing it risks the whole system collapsing under the weight of students asking for scripts just because they can - I normally process about 250 script requests. If everyone asks for their free ones this year it would mean I had to do more than 3000. That just isn't going to happen.