Slightly grumpy with Zen. After getting an e-mail saying I was getting an upgrade on the ninth, nothing happened. I restarted the modem to re-sync the line and the speed dropped from 26Mb/s to 20. Rebooted again and it dropped to 14! Did another reboot and it went back to 20.
Called Zen who said that as the speed was above 15, it wasn't a fault (on installation, I was getting 30) and that the e-mail should have said that the upgrade was being done in batches, and it should take place this week.
I wait with interest.
(On the other hand, it is still 10 times faster than I was getting with ADSL, and the upload speed is faster)