"Puck of Pook's Hill" is something of a curiosity. The theme of the book is England and what made her, as related by characters who are conjured-up by Puck to give what would be called "eye-witness accounts" today. These characters include a knight, a Roman centurion and a Jewish physician from the time of the Magna Carta. There is a lovely feeling of place about the book - and in particular the timelessness of place, with many of the stories set around the Downs and the Weald of Kent, where Kipling lived.
I do have to say, unfortunately, that I doubt that this book would offer much of relevance to children today. With the changes in the way children are taught history, from the "living history" actors that pop out at each tourist attraction to tell their tales to CG films portraying famous historical incidents, learning about history has left the dusty books that the children in this story had to learn from far behind. And I expect that Una and Dan would now be seen as "historic" as many of the other characters that appear in the story. But, although I would hesitate giving this to my son to read, I did enjoy losing myself in "Old England" for a while.