We're investigating reports of DNS problems
We had inadvertently added an incorrect nameserver (e.nameless.aa.net.uk) to our aa.net.uk domain at Nominet. This was causing around 1/5 of DNS lookups to fail. This has now been removed.
Due to DNS caching it may take a little while for the internet to catch up. In practice this may mean that access to some of our services may not be reachable from some places.
This problem is has been resolved.