CREATE TABLE table_12109 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent in the final" CLOB, "Score" CLOB)

What was the playing surface for the Tournament of Great Britain F16?
SELECT "Surface" FROM table_12109 WHERE "Tournament" = 'great britain f16'
SELECT "Surface" FROM "table_12109" WHERE "Tournament" = 'great britain f16'