<p>A radical new ruling banning tackling above the waist in amateur rugby has sent shockwaves through the sport. </p><p>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? </p><p>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. </p><p>And we get the view of England men's most-capped player Ben Youngs on a directive that’s divided rugby.</p><p>Panel: Delyth Lloyd, Dan Roan, Chris Jones</p><p>Producer: Sam Sheringham</p>