UK amateur fossil hunters' mammoth haul

Cotswolds couple Sally and Neville Hollingworth are part-time paleontologists who have struck archaeological gold twice. Four years ago they exposed the site of five ice-age mammoths, in a 200,000 year-old mammoth graveyard. After lock-down this year they unearthed a 167 million year old haul of fossil echinoderms, some of which are brand new to scientists, and which have been hailed by London's Natural History Museum as "of global significance". Sally and Neville join Kathryn to talk about the skill (and if there's any luck involved) of being a successful amateur fossil hunter.