Refusing to share coop while laying

[aart]

I will give the fake eggs a go and if that fails I will put up a new nest box elsewhere. I (and undoubtedly my neighbours!) am very grateful for the suggestions, thank you! Does anybody know roughly how long after putting a fake egg in place it takes for them to catch on? Just want to make sure I persevere for long enough!

Hopefully within a few days, but just leave one fake egg in each nest full time.