How did Halloween evolve into trick or treat?

King Charles and Pope Leo made history in the Sistine Chapel by praying side by side - a first for the leaders of the Church of England and Catholic Church. In this week's edition of our series on the study of religion, theologian Robert Beckford goes back to school to explore the teaching of RE at GCSE and A Level. Halloween may be on the minds of trick or treaters, however another festival is celebrated at this time of year - we explore Samhain that's observed by followers of Paganism.

PRESENTER: EDWARD STOURTON PRODUCERS: KATY BOOTH & CATHERINE MURRAY STUDIO MANAGERS: JOE STICKLER & CHRIS WALKER EDITOR: CHLOE WALKER