CREATE TABLE table_4486 ("Region" TEXT, "Operator" TEXT, "Licence award date" TEXT, "On air date" TEXT, "Closure date" TEXT)

What date was the ensemble in North East England closed?
SELECT "Closure date" FROM table_4486 WHERE "Region" = 'north east england'
SELECT "Closure date" FROM "table_4486" WHERE "Region" = 'north east england'