Nike have a programme where they accept your worn-out athletic shoes and
turn them into Nike Ground sports surfaces. Here are the drop-off
locations in Northern England, or you can post them to them. They also
have locations in the South and Midlands.

http://letmeplay.com/reuseashoe/locations/europe

Reuse-A-Shoe: Locations

UK DROP-OFF LOCATIONS Nike Factory Store
Lowry Designer Outlet Village
G28 - 29 Quarys Road, Salford

Nike Factory Store
Cheshire Oaks Outlet Village
Unit 31 Kinsey Road, Ellesmere Port

Manchester United F C
Carrington Training Ground
The Cliff Training Ground
Littleton Road Training Ground
Main Reception
Box Holders Reception
North Stand
Red Café
Museum
MUML Reception
Megastore

Friends and sons and daughters of Cumbria in outlandish parts may consult:
http://letmeplay.com/reuseashoe/locations/usa
and
http://letmeplay.com/reuseashoe/locations/australia

Unfortunately, Johnny, I couldn't find a Canadian drop-off.

Jp