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 F.A.Brock, Director, C.T.Brock & Co.’s 'Crystal Palace' Fireworks Limited, Sutton, Surrey, apologizing for an error concerning an order for cartridges.