Part of the response from OUP, if anyone is interested.
'Dear Tilly
Thank you for your enquiry. I appreciate you taking the time to share your views.
You may have read coverage that suggests that Oxford University Press (OUP) has changed its policies regarding the content of our books, or has specifically ‘banned’ mentions of pigs in its UK titles. I would like to assure you that our author guidelines have not recently changed, and there is no such ‘ban’.'