Just saw that there will be an hours maintenance tomorrow, so this means that Home will most probably be down during that time also.
I think 5pm UK time equates to 12pm EST.
Just thought I'd give you guys a heads up, sorry if there's already a thread about this, I never saw it.
And for those that would rather see a post from SCEA
In order to continue to deliver you the best online games experience, we will be performing maintenance to upgrade the software for the PlayStation Store on Thursday, August 29. This maintenance will occur between:
During this maintenance period, you may receive a message that states “Sony Entertainment Network is undergoing maintenance” when attempting to access the PlayStation Store or PlayStation Home.
We will update you with any changes that may occur in regards to this scheduled maintenance. If you would like to receive a notice when PSN is fully restored, be sure to follow the official PlayStation Twitter account and our support Twitter account, @AskPlayStation.
And there's also a forum maintenance coming on Friday. http://community.us.playstation.com/t5/PlayStation