Offical EU page, says....
And to confirm I can not access any online parts of games including GT5.
http://community.eu.playstation.com/t5/PlayStation-Network/PSN-Maintenance-scheduled-from-Thursday-11th-August-16-00PM-BST/td-p/13389963
PSN Maintenance scheduled from Thursday 11th August 16.00PM BST until Friday 12th August 03.00AM BST
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on 03-08-2011 12:05 PM
Maintenance has been scheduled to take place on the PSN from Thursday the 11th August at 16.00PM BST until Friday 12th August at 03.00AM BST.
For the duration of the maintenance period the following services will be unavailable:
PlayStation Store
Account Management
Account Registration
PlayStation Home
Please note other online game titles and applications may also be affected.
Users who are signed into the PlayStation Network at the beginning of the maintenance should be able to stay signed in for the duration (however the above services will still be unavailable).
If you attempt to sign in to the PlayStation Network after the maintenance has started, you will receive the site maintenance notification page.