Classic ‘Hobbit’ Size Dimensions Over the Years

This one MAY be for more ‘seasoned’ collectors.

I recently got a Hobbit Facsimile Gift Set, and one of the things I noticed about The Hobbit itself in that set, was its size.

No this isn’t meant to be a joke in hobbits being small, but I noticed that it’s shorter than a ‘typical’ hardcover - Tolkien, or otherwise.

I have a 70th Anniversary Edition, and that edition matches (I’m referring to size here) my LotR 60th Anniversary Boxed Set (and The Silmarillion and Unfinished Takes also from that style.)

I’m also aware of ‘The Tolkien Library’ Boxed Set from the ‘70s: The Hobbit in that set, matches - in size - the corresponding LotR, Silmarillion….

Which brings me to my question: for the UK editions, at which point did The Hobbit go from a smaller/shorter book, to one of more ‘standard’ size? (I’m referring to the ‘classic’ hardcover editions, with Tolkien’s dustjacket and interior art.)

Thanks!