But the process has been little short of calamitous, resulting in a twomonth service disruption that has left customers struggling to use its branch and online services.

Since then there has yet to be a widespread service disruption due to infrastructure damage.

Spare parts and back-up systems should be in place prior to ash fall events to reduce service disruption and return functionality as quickly as possible.

Engineers reported that the service disruption could last a week.

Other factors, such as weather, could also have an impact on the number of service disruptions that could potentially occur.