How a Boy’s Concussion Death Changed British Sports

ROSEWELL, Scotland — At the end of a nearly three-year investigation filled with his frustration and suspicion toward headmasters, coaches and the police, Peter Robinson finally heard the verdict that he feared: His 14-year-old son, Benjamin, had died after being hit in the head multiple times during a rugby match in which he should have been pulled from the field.

As a heartbroken Mr. Robinson and his family left the Old Townhall Courthouse in Belfast, Northern Ireland, that day in September 2013, they were told they could slip out the back to avoid the news media. But Mr. Robinson was determined that his son should not die in vain, so he, along with his ex-wife, Karen Walton, and their…