This memorial was originally sited at the west end of the north aisle in the nave. The exact position is unknown.
Memorial
Inscription (From the 1873 Guide)
NEAR THIS PLACE ARE DEPOSITED THE REMAINS OF
SIR JOHN LAFOREY, BARONET,
ADMIRAL OF THE BLUE SQUADRON,
WHO DEPARTED THIS LIFE ON BOARD HIS MAJESTY'S SHIP
"MAJESTIC" AT SEA, ON HIS PASSAGE FROM THE
WEST INDIES, ON THE 14TH DAY OF JUNE
IN THE YEAR OF OUR LORD, 1796, AGED 76 YEARS
SIR JOHN LAFOREY, BARONET,
ADMIRAL OF THE BLUE SQUADRON,
WHO DEPARTED THIS LIFE ON BOARD HIS MAJESTY'S SHIP
"MAJESTIC" AT SEA, ON HIS PASSAGE FROM THE
WEST INDIES, ON THE 14TH DAY OF JUNE
IN THE YEAR OF OUR LORD, 1796, AGED 76 YEARS
Further Information
A biography of Sir John Laforey appears in Wikipedia. He seems to have had no direct association with Portsmouth other than that he was buried in the church having died en route to England from the West Indies.