Mr. and Mrs. Green should seek a mandatory injunction quia timet to compel the factory owner to demolish or repair the wall. In cases where there is an imminent risk of physical injury or damage, such as the potential collapse of a wall, a mandatory quia timet injunction is appropriate. This type of injunction is preventative and compels positive action to avert the threatened harm. The case of Birmingham Development Company Limited v Tyler [2008] EWCA Civ 859 supports this, stating that if there is a risk of significant harm, the court can grant such an injunction. An interlocutory or interim injunction is temporary and intended to maintain the status quo pending a full trial, which would not address the Greens’ immediate need to make their garden safe. A prohibitory injunction would prevent the factory owner from committing a future wrong but would not compel the necessary repairs. Seeking damages addresses past harm but does not provide the immediate relief required to prevent potential injury from the wall’s collapse. 

Key Point: A mandatory quia timet injunction is crucial in nuisance cases where imminent danger requires proactive measures to prevent harm. This type of injunction ensures that the threat is addressed before any damage occurs, restoring the claimant's ability to use and enjoy their property safely.