The Duke of Cambridge has urged the country to “stand up, not stand by” to combat bullying, which has become “unrelenting” because of social media.

The Duke, who has recorded a video message to support the first ever National Stand Up To Bullying Day, said no one was immune from bullies.

He said: “Bullying is an issue which can affect any one of us, regardless of age, background, gender, sexuality, race, disability or religion. It can happen for many reasons, it is often stupid and cruel, and can take many forms.