Tom's Midnight Garden

No UK book-club issue is documented in the sources consulted. The tells that actually matter are OUP's own reprint lines added beneath 'First published 1958' on the copyright page, and the later Puffin and Oxford paperback reprints, which carry ISBNs (10-digit ISBNs from 1970 onward) and are first-thus at best. Any copy dated 1958 on the title page but showing an impression statement on the verso is a later printing, not a first.