129 Cadogan Terrace. A memorial to Thomas Briggs Esq. of Clapton who on Saturday 9th July 1864 was viciously assaulted near here on a North London railway train. Carried near to death into this public house he died at home later the same day. He was the first person to be murdered on a railway train.

The plaque predates the current residential development at 129 Cadogan Terrace. The Top O' The Morning public house, formerly the Mitford Castle, closed around the end of 2012 and was demolished in August 2015. See this article for the story of the murder.