Problem solved....

Here is another shot with Deborah and Kevin's little rented cottage - included this time to tell a brief moment in its history,

As you will see there are three cottages, same design, side-by-side.

It seems there was a 19th century Christchurch well-to-do businessman.   He had three daughters.    Perhaps they argued a lot around the house.  Anyway, he solved the problem by building three identical cottages, installing them therein, and leaving them to their own devices.