What’s the first book you ever finished and still remember to this day?
Well if you ignore the phonics ones and things like Binkle and Flip the bad bunnies.

Peter, Jane and Pat the dog.
And of course:

I suppose I would go for The Hobbit.
Still occasionally read it most years.
Looking at Binkle and Flip there it does have a bit of an air of Mr Bunsy has an Adventure. (If you know Terry Pratchett books you will know which one it comes from).