We will be rebooting the system R015.lon1 at 00:05 Wednesday 30th September to apply updates. This should take no longer than 15 minutes to complete.

Edit @ 10:44 BST: The system requires an emergency reboot due to an issue with the new hardware, apologies for the disruption. Edit @11:10 BST: The issue is now resolved and the system is running on a new CPU Optimized instance type.