I'm rather excited to report that I just finished Whispering to Witches, a novel by Anna Dale. I was hesitant after the first few chapters, mostly because it seemed to be targeted at the Harry Potter-aged audience and the grammar was a bit different, being written from 'across the pond,' but I'm extremely pleased with this book.
As I said earlier, the target audience would match those of the Harry Potter books, but this book surpassed Harry Potter for me. It didn't have the commercially cute and whimsical characters or some silly 'growing up witchy' rituals or school. It was simply a book about a young witch trying to come into her own by herself, using her mind and problem solving.