Kathleen Ferrier blue plaque | Open PlaquesKathleen Ferrier blue plaqueThe plaque is a surface mounted enamelled steel model, chosen as it fitted more comfortably into the available space on the building's facade. Spudgun67 on Flickr How to add yours Spudgun67 on Wikimedia Commons Megalit on Wikimedia Commons Simon Harriyott http://openplaques.org/plaques/585