Spotted on the Network Status page:

Downtime scheduled - Downtime scheduled 10/17/2008 5:00 AM London Time / 10/16/2008 9:00 PM Pacific Daylight Time

This is a notification that UK worlds will be updated at 5:00 AM London Time on the 10/17/2008. The estimated downtime will be 2 hours.

- SOE Operations team