The Archbishop of York John Sentamu tweeted:
Through his actions and perseverance, Nelson Mandela managed to help transform a nation, tackle injustice and give hope to millions.
Six-year-old Emma Williams was invited to sit on Nelson Mandela's lap when he visited Wales in June 1998. Now 22, she speaks to ITV News.
Nelson Mandela touched aspects of British public life in a way that very few other international figures have managed.