This is a free, online translation of the complete Anglo Saxon Chronicle. Whilst it might not win a prize for greatest novel ever, it is a very good resource when writing your own source questions, particularly for the Norman Conquest (commonly covered in KS3 and for the History 13+ Common Entrance exam).
Similarly, short passages can be used to go through primary source analysis with students. The chroniclers (there was a great number of them) were all Anglo-Saxon clergy with a bias against the Norman Conquest.
For more accomplished students, or as a revision activity, you could give a larger section with a few other sources and ask a student to write their own exam questions (and mark scheme, of course).