Hedge Laying

Not a Bill Hook in sight... Despite having had chickens for the past couple of years Im totally stumped, two out of our 6 girls have started to lay in the hedges around ours and the next door neighbours garden.
We open the run so they have the full garden when were at home and at work. Theyre all very athletic and get out of the run anyhow. I have identified the ladies in question and have found their nests 27 eggs laid in total (No Easter Bunny either).
The other girls return to the house to lay and their all more than happy to go in a night. I have thought about leaving them in the house for a couple of days to force them to lay in the house. Any thoughts would me most welome 

beware!!!!!         if they can escape foxes and other unfriendly criitters can get in!!!!!!!!!!!!!!!!!!!

Thanks for your thoughts on this one. :happy: The girls have been reclipped . I am now in the process of putting about 6-8 inches of garden net at right angles to the top rail of the run. Hopefully this will stop them getting on there and jumping out. Ill keep them in the run until theyve hopefully forgotten about the hedge.

I dont want to end up building some sort armoured run to keep them in and whilst I am aware of the Fox issues we like them to be as free as possible whilst laying in the house. This is despite losing a couple of Blue Belles from the garden during the day to a Fox strike.
The active den is just over the farmers field from the house and while Fox issues have been debated since time and memorial to me its all part and parcel of having chickens.