William Butterfield blue plaque | Open PlaquesWilliam Butterfield blue plaqueWilliam Butterfield blue plaque | Open Plaques Spudgun67 on Flickr How to add yours Spudgun67 on Wikimedia Commons Spudgun67 on Flickr Mike_fleming on Flickr Simon Harriyott on Flickr Nick Harrison on Flickr Nick Harrison on Flickr Nick Harrison on Flickr http://openplaques.org/plaques/399