When working for C.J.Williams the widowhood sections were attached to the Hen section behind. The nest boxes were 3ft deep and separated in the middle by a solid removable partition with a small sliding slot roughly 1 x 2 ins, 4 ins from the bottom. After pairs had bred 1 youngster the hen was put through the back loft and the partician was put in place, the hen was allowed to see the cock untill she had settled and realised that was her future perch then the sliding hole was closed and only opened when the cock was being sent to a race and on return. Looking and sweeping to each other was the only contact untill the end of racing when they were allowed to-gether and reared a late bred. It was very successful for us.