The lead researcher Dr Ben Wheeler said loads of explanations had been suggested, although they had not yet been tested.

BBC: People feel 'healthier' on the English coast

Ben Wheeler was among the 20 first-graders and six adults killed in the Dec. 14 attack at Sandy Hook Elementary School in Newtown.

NPR: In White House, Newtown Mom Pleads For Gun Control

"Life in Britain: Using millennial Census data to understand poverty, inequality and place" by Ben Wheeler, Mary Shaw, Richard Mitchell and Danny Dorling is published by the Policy Press.

BBC: The gap between rich and poor is still wide, the report says