CREATE TABLE table_53503 ("Location" TEXT, "Londonborough" TEXT, "Post town" TEXT, "Postcodedistrict" TEXT, "Dialcode" TEXT)

Which Post Town has a Dialcode of 020 and is located in Hook?
SELECT "Post town" FROM table_53503 WHERE "Dialcode" = '020' AND "Location" = 'hook'
SELECT "Post town" FROM "table_53503" WHERE "Dialcode" = '020' AND "Location" = 'hook'