100 Best Books for Children: 0-5
http://www.booktrust.org.uk/books/children/booklists/241/
100 Best Books: 6-8 years
http://www.booktrust.org.uk/books/children/booklists/242/
100 Best Books: 9-11 year olds
http://www.booktrust.org.uk/books/children/booklists/243/
Recommended Reads for Year 3
Recommended Reads for Year 4
Recommended Reads for Year 5
Recommended Reads for Year 6
But remember, academic year group/age is no barrier to enjoying a good book- feel free to dip into the suggested reads for other year groups!