I don't remember much. But what I can remember: Sophie and Howl are married, Sophie is expecting; Howl and Sophie go to Wales; in Wales he takes her to a curry shop and then to his pub (where they only speak Welsh) so he can watch rugby; there is a fair bit of Welsh spoken.
I'm studying Welsh on my own, and thought htis might be a fun way to further my reading skills.
ETA: Found! A thousand humble thanks!