I enjoyed this. The only reason I read this is that it relates to some research I'm doing, but what it aims to do I think it does very well.
This is aimed at school-aged readers but it quite readable and informative for adult readers. The detail comes across as authentic; it appears well researched. Sometimes the exposition is a little heavy-handed, as though a scene only exists to convey historical information, rather than serving the story, but given the educational intent, I think this is quite acceptable.
Overall a worthwhile read for anyone interested in life on the home front and in a military hospital in Southern England, 1940.