CREATE TABLE table_43808 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Attendance" TEXT)

WHAT'S THE TIE NUMBER WITH AN AWAY TEAM OF WREXHAM?
SELECT "Tie no" FROM table_43808 WHERE "Away team" = 'wrexham'
SELECT "Tie no" FROM "table_43808" WHERE "Away team" = 'wrexham'