K6 Phones Boxes, Middlesbrough Posted on December 27, 2013 by chris.twigg This line of phone boxes behind the Town Hall are a Grade II Listed Building They no longer contain any telephones and have been adopted by the council. The K6 was designed by Gilbert Scott to celebrate King George V’s silver jubilee in 1935 Share this: Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Share on Facebook (Opens in new window) Facebook More Share on X (Opens in new window) X