Warner Bros said that while it was ”delighted” she was a Harry Potter fan, ”no one may copy, license, exhibit, reproduce or otherwise trade on the Harry Potter Properties without the prior authorisation and consent of Warner”.

”Warner does not, of course, object to you holding a generic wizard/Halloween night.”

Ms Marmite Lover said she had written back to Warner Bros informing them she had changed the name of her dinner to Generic Wizard Night.