However, as with any change, there is a risk, classified as low, that a problem with the upgrade could be encountered, which would require rolling back the updates.

In the unlikely event that CNS needs to roll back the updates, CNS will require a two-hour outage to all services within the 6-hour window already defined above.

Should they need to invoke the outage procedure beyond the advised window, additional contingency communications will be provided at that time.

These updates are part of a series of work performed over six separate occasions, with the remaining schedule to be advised in due course. This is the first of 6. With each upgrade, the risk will decrease for each deployment.

The updates have been tested in lower environments, and we expect no disruption to Services as we update the Production environment.

CNS said they would like to thank traders for their patience during this time and apologise for any inconvenience it may cause while conducting this essential work.