I've just had this notice from the web host that they are upgrading software tonight and this may cause access issues around 10pm GMT (11pm BST):

Quote:

I am writing to inform you that we will be rebooting the physical server which hosts your site around 10pm GMT this evening.

There have been several updates released for the core software packages. This requires a reboot of the server.

We do not anticipate any problems with this update, however, a full backup has been scheduled before the update just to be safe.

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