We are planning work on a router this evening between about 7pm and 9pm UK time. While we're switching between routing equipment it is possible that some websites, some private servers and file stores may be inaccessible for up to ten minutes. We will of course try to keep disruption to a minimum. Apologies for any inconvenience.
Update, Sunday 21 October: the work is complete. Interruption to affected services was well under a minute.