There is one maintenance window scheduled for next week:

.UK
The .UK registry has a maintenance window on Tuesday, March 3, 2009 for software upgrades.

Date: Tuesday, March 3, 2009
Time: 08:00 – 09:00 UTC
Duration: 1 hour
Your local time: Start to end

Service Impact:
Domain provisioning and WHOIS will be unavailable. Customers who have enabled provisioning queuing will have their orders queued until this complete. Domains will continue to resolve normally.

Also , just a reminder that there is an OpenSRS Services maintenance tomorrow.