A radical new ruling banning tackling above the waist in amateur rugby has sent shockwaves through the sport. But is it a necessary change to address the epidemic of serious head injuries, or a radical departure that alters the essence of rugby and could prompt a mass exodus from the game? We take you to a grassroots rugby club still reeling from the ruling - and hear from influential scientist Ross Tucker whose research has prompted the change. And we get the view of England men's most-capped player Ben Youngs on a directive that’s divided rugby. Panel: Delyth Lloyd, Dan Roan, Chris Jones Producer: Sam Sheringham