ArcGIS have now marked the incident as Resolved in their status page.
Apologies for any inconvenience.
ArcGIS have posted an update to their status page about services stabilising:
"We're experiencing some infrastructure related issues that have caused some intermittent timeouts across various arcgis.com sites and services.
The issue has stabilised and we are seeing some recovery but are continuing to investigate"
We'll update/resolve this post accordingly as they progress.
We have received some reports that the online version of ArcGIS is unavailable.
A '504 Timeout' error is received when attempting to browse to uostandrews.maps.arcgis.com
ArcGIS have acknowledged this issue on their own status page - which can be found here
We will update this post accordingly once ArcGIS investigate and progress.
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