The Oxford Mail has a bit more detail about one of the new Tolkien books which accompany the Oxford exhibition.
“Tolkien Treasures highlights of the Tolkien archives held at the Bodleian. It focuses on J.R.R. Tolkien’s childhood in the Midlands and his experience in the First World War, as well as his studies at school and at Oxford University’s Exeter College.”
Excellent, a nice tight focus. 144 pages and somewhat affordable too, at £12 retail. It’s on Amazon UK under the slightly different title “Tolkien: Treasures” and at an even better £10.50.