Jenrick: My defection will 'unite the right'

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Robert Jenrick says helping Reform's Nigel Farage become PM will be "worth the pain" of defecting from the Conservatives. But will he really help 'unite the right' of politics? Also on the World at One, how a new map of the Antarctic is changing scientists' understanding of what lies beneath the frozen continent's ice sheets. And, as rumours circulate that 2026's hottest new music star is an AI creation - who is Sienna Rose?