Late TENs are intended to be used by premises users who are required for reasons outside their control to, for example, change the venue at short notice.
Bwriedir i hysbysiadau hwyr gael eu defnyddio gan berchenogion safleoedd y mae’n rhaid iddynt, er enghraifft, newid y lleoliad ar fyr rybudd am resymau y tu allan i’w rheolaeth.