I wouldn't leave it as late as "near the 9th" as that might mean you don't get the 19th. As the prof says, I'd ask PlusNet the best way of specifying the 19th and timing the order.
To be strictly correct the 30 day validity of the MAC is from the issue of it by Openreach to your old ISP and receipt by Openreach from your new one. It is normally submitted to Openreach by the new ISP within minutes of your order.
If you are migrating from Be you need to be careful. Is there a reason for the 19th, such as a notice period with the old ISP, that you care to share, or is it irrelevant to the process?
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.