Battle of the River Plate
The cathedral is in possession of the Garter banner of Lord Shackleton, which hung in St George's Chapel, Windsor Castle, during his lifetime. On the south wall of the cathedral is a White Ensign flown during the Battle of the River Plate by HMS "Achilles". A wooden plaque below the flag has the inscription: "One of the ensigns worn by HMS "Achilles" at the Battle of the River Plate 13th December 1939". In the front of the building is a whalebone arch monument, made from the jaws of two blue whales, erected in 1933 to commemorate the centenary of British rule in the Falkland Islands.