They did eventually shut up after about 3 hours . Then the new girls had a look out of their coop, and tentatively wandered out - it was wonderful to see them experience the feel of grass underfoot and rain on their feathers. There was a bit of "feather flaring" through the mesh between the 2 lots at one point, but I guess that's just all part of getting to know each other. The newbies also presented me with 2 eggs too