CREATE TABLE table_43538 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

Which tie number has Bolton Wanderers as away?
SELECT "Tie no" FROM table_43538 WHERE "Away team" = 'bolton wanderers'
SELECT "Tie no" FROM "table_43538" WHERE "Away team" = 'bolton wanderers'