You have a common slight misunderstanding
The 30-days validity of the MAC is from the date it is issued by Openreach to Enta, who normally pass it on to you immediately, to the date the new ISP submits a migration order to Openreach accompanied by the MAC you gave them. That's usually the day you order from the ISP, as long as you give them the MAC.
The migration itself doesn't need to happen within 30 days of issue. It is often much later.
The trouble with giving notice early is if Openreach renege on the promised migration date. It is happening quite a lot these days. So then your existing service gets cut off because your 30 days notice expires so the contract ends.
Don't Enta still refund unused parts of the subscription as long as something like 10 days has elapsed since the MAC is issued? If they do, you don't get overlap anyway.
Edit - I think it may be it was that if the migration is more than 30 days after the MAC issue they just charge you the next month at the normal time, then refund when it happens, because the 30-day notice started by you asking for the MAC has been completed.
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Edited by RobertoS (Mon 26-Aug-13 18:01:43)