The Bears took an early lead when skip-per and half-back Alex Brown powered over near the posts, and the gap was extended on five minutes when centre Chris Brown went in on the wing.
A further try on ten minutes by hooker Matty Allsopp gave Bears a platform from which to sew the game up, and Ben Powis - playing his first game for the side for eight years - scored on the left before player-coach Ty Watson crossed in the opposite corner to secure a 28-0 lead, J&S Landscapes man-of-the-match Graham Healey adding four conversions.
Derby finally troubled the scorer with a converted try, only for Cooper - coming off the interchange bench - to break through the middle and score between the posts, Healey converting.
Another newcomer, England Lionhearts full-back Richard Whitehouse jinked through to complete the first-half scoring, but with the referee finding fault with the Bears and Watson sin-binned for holding down an opponent when the opposite seemed the case, Derby nipped in for two tries and then put over a drop goal after Cooper again carved through the home defence for his side's only score of the half.
Bookmark or share this story with: