OK - this is the clincher.
You LO has a friend home for tea after school. They are safely out in the garden playing. The friend's book bag is on the kitchen table. Do you:
a. Have a look to see what reading level he's on
b. Think about doing a. but resist.
c. a. would never have occurred to you and you are genuinely shocked at the thought
d. a. would never have occurred to you, but now it has......?