 The chapel was not formally opened until 1929 by which time much of the lavish interior decoration of marbles and mosaic in a mix of Italian gothic and romanesque styles had been added, giving it the appearance it broadly retains today.The chapel is a Grade II* Listed building.The fabric of the chapel was allowed to decline in the closing decades of the Middlesex Hospital, with water ingress through the roof causing substantial damage to the fabric of the building.