While the redecoration is in progress, a "secret shooter" film-interviews the set-up person while he is out, the footage of which is then used for the purpose of quizzing the person at home.
While the redecoration is in progress, a "secret shooter" trails the person who has been sent out of the house, and film-interviews them. The footage is then used for the purpose of quizzing the spouse, friend or relative at home.