My upgrade email from ADSL to Unlimited Fibre 1 was received by me on the 23rd of April 2015 and was titled: Your Zen Internet Upgrade Confirmation #[CONFIRMATION No.]
Then in the body of the email: "We will upgrade your line to Unlimited Zen Fibre 1 on 07/05/2015."
After that it listed my phone number and the installed address etc. etc.
Then on the 7th May my upgrade from ADSL to Fibre took place on the 7/5/15. The email confirming the upgrade had taken place came at 12:35pm on the 7th May. Unfortunately I dont actually recall *precisely* when it switched over before 12:35pm.
In my experience with regrades, the email will state "Anytime until 11:59" on the day scheduled, but the regrade will probably go through at c. 1.15 am on the day of regrade. That's when I regraded to Unlimited 2, but my line won't sustain above 40Mbits/sec stable, so I downgraded after a few months.
ZeN Unlimited Fibre 1