[DONE] Should be shown as a different edition, but is now a "seperate" book

[Jasmijn Zielman]

The new editions of rivals: 9781804994221 - now appears as a seperate book, but show be a different edition of 9780552156370 .

Please merge these 2 together on the page of the original, and give the new one just a different edition page.

[Shim]

The editions have been combined.

Please edit the title / subject of your post and add [done] so other Librarians know it is complete.