CREATE TABLE table_56403 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT)

I wan the date of vacancy for departure of resigned and outgoing manager of gordon wylde
SELECT "Date of vacancy" FROM table_56403 WHERE "Manner of departure" = 'resigned' AND "Outgoing manager" = 'gordon wylde'
SELECT "Date of vacancy" FROM "table_56403" WHERE "Manner of departure" = 'resigned' AND "Outgoing manager" = 'gordon wylde'