A fix has been implemented and is currently being monitored.
Working with our DNS Service Provider, manual changes to work around the issues have been made today. These changes have now propagated through DNS, so this process should now be working correctly, although we expect propagation to continue for the next 48 hours.
We expect our DNS Service Provider to have completed their migration activities over the weekend and do not expect any more interruption as a result of this.
We apologise for the inconvenience caused by this outage, will be reviewing with our provider, and will be taking appropriate steps to negate this outage in future.