Tales From the Perilous Realm binding

Hello everybody,

I'm a rather fresh collector of the Tolkien books.

Recently I ordered a bunch of them ranging from The Hobbit to the Silmarillion. All of them seem to have high quality prints (HarperCollins UK-editions), however to my disappointment the "Tales From the Perilous Realm"-book (9780008453343) is having a glued binding compared to the sewn binding of all the other books in the same style publications.

I tried to check out if the older published version from 2008 (9780547154114) was having a sewn binding, but from the pictures and videos I've been able to find about the book it also sadly seem to have a glued binding.
So from my limited knowledge about the publications of these books it only seems to be the deluxe slipcase version (9780007286188) that actually has a sewn binding (with a ribbon bookmark) if I'm correct.

Anybody who can confirm this?