Inevitably my mat cover is reluctant to give up some of her role though she is technically stepping down as my mat cover for the 2nd time. I officially return to work next Monday but have been getting emails and work to do in the run up. My cover is pushing for part of my role, she has technically been promoted to a deputy manager role and is now my no 2. Tensions are high on both sides as I want to get back into leading my team and she wants my role! I can understand her wanting to function at the same level, but she knew she was stepping up for me and it would end on my return. How would you gently but firmly let her know what her parameters are? She seems not have no boundaries or understanding even though I have repeatedly tried to let her know. I don't want to start things on the wrong foot as it will set the wrong tone when I need her on my side..