Bruce Ismay was the chairman of White Star Line who commissioned RMS Titanic - and, notoriously - a survivor of the sinking.
The Ismay family plot is a large one. This tomb-chest stands in the centre of the plot, but there are also an upright slab (with biblical inscription), an elaborately carved stone bench (with a verse inscribed), and a plain tomb-slab (marking the graves of other members of the family).
The tomb-chest has low-relief carvings of sailing ships on three sides, and a similar representation of a ship's compass on the fourth. It is signed 'Gerrard 1939' - which I take to mean A.H. Gerrard, later professor at the Slade School of Art.
The Ismay plot lies in the southernmost corner of the cemetery, on a north-facing slope - and for much of the year is heavily shaded by trees.
See:
TQ2272 : The Ismay plot, Putney Vale Cemetery: Behold also the ships . . . .
TQ2272 : The Ismay plot, Putney Vale Cemetery: the ship's compass
TQ2272 : The Ismay plot, Putney Vale Cemetery: the bench
TQ2272 : The Ismay plot, Putney Vale Cemetery: The little birds sang east and the little birds sang west