So this is it. Game Of Thrones has finally reached the end of its source material. There are no more big surprises for readers of A Song Of Ice And Fire to feel smug about. No more threatening the unsullied show watchers with spoilers. It’s a weird place to be in as a book reader - this must be how season one felt for everyone new to George RR Martin’s saga. I can’t quite decide whether I’m excited about that, or whether it’s deeply, deeply scary.