After exhibiting lots of promising signs (wattles and combs getting even bigger and redder, a new habit of crouching when I get close, plenty of clucking) we have had the first eggs from the 'new' girls.
I think (but don't have hard evidence) that both Betty and Wilma are now laying. Jules is a bit behind and will be a while yet, I expect.
The very first egg was broken, I think by someone else coming along and pushing it out of the nest box. These two (right) were next on the scene.
As you can see, they are speckled. Will keep you posted if/as the size and color develops when the girls have had more experience!