Papers of the Sykes family of Sledmere > Papers of Sir Mark Sykes (1879-1919) (Second deposit of Papers of the Sykes family) > Correspondence > File of general correspondence. Letters and telegrams to Mark Sykes > Letter from Joseph Thorp, Secretary to the Agenda Club, temporary offices at 6, Denmark Street, Charing Cross Road, W. C., discussing the 'Open Letter' that Mr Sykes had sent.