According to the 1873 Guide to the Church this memorial was originally sited in the North Transept, an area now largely occupied by the organ. It is known that the memorial remains in situ behind the organ.
Memorial
(From the 1873 Guide)
IN MEMORY OF BREVET MAJOR HENRY BUCK, WHO DIED AT PORTSMOUTH ON THE 21ST DECEMBER, 1862, AFTER HAVING SERVED FOR 18 YEARS IN THE 63RD REGIMENT, AGED 36 YEARS. ERECTED BY HIS BROTHER OFFICERS IN TOKEN OF THEIR ESTEEM.