CREATE TABLE table_16674 ("Rd." FLOAT, "Grand Prix" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Constructor" TEXT, "Report" TEXT)

How many drivers had the fastest lap at Silverstone?
SELECT COUNT("Fastest Lap") FROM table_16674 WHERE "Location" = 'Silverstone'
SELECT COUNT("Fastest Lap") FROM "table_16674" WHERE "Location" = 'Silverstone'