Dot Cotton

Dot Cotton was a fictional character who appeared in the British soap opera EastEnders. Clara Oswald described her as a "famous Cockney chimney".

During the Twelfth Doctor's imprisonment in the Prison, Clara took one of Class 2A's art lessons. She asked the students to paint a placard with the phrase "SAVE THE DOCTOR", but instead they got confused and began to paint "SAVE DOT COTTON". (PROSE: The Blood Cell)

Behind the scenes

 * Clara's description of "famous Cockney chimney" refers to Dot being a well-known chainsmoker.
 * She was played by Doctor Who guest actor June Brown.