A top British publisher has warned its writers to steer clear of mentioning pigs, sausages or pork-related words in books, in an apparent bid to avoid offending Jews and Muslims.

The existence of Oxford University Press guidelines emerged after a television discussion on free speech in the wake of the Paris attacks.

A spokesman for OUP said: “OUP’s commitment to its mission of academic and educational excellence is absolute.

“Our materials are sold in nearly 200 countries, and as such, and without compromising our commitment in any way, we encourage some authors of educational materials respectfully to consider cultural differences and sensitivities.”

OUP’s books are sold all over the world, including Israel.