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June 15, 2026 14:55 BST Scheduled - Engineers from our UPS service provider and manufacturer will be performing inspections and essential maintenance on our UPS systems that supply our Maidstone facility. Each feed will be worked on separately, and each UPS will be switched to bypass only after the load has been transferred to our generator farms. Although minimal, customers should consider one of their power feeds to be ‘at-risk’ during the period detailed above. Customers with diverse power supplies will only have one feed at risk at any given time, diverse feeds at our facility come from different ATS+UPS chains and are totally independent. This is an at-risk notification only, we do not expect any customer impact during these works. June 29, 2026 08:00 BST Active - Scheduled maintenance is starting. June 29, 2026 18:00 BST Completed - Scheduled maintenance is complete.

May 29, 2026 17:42 BST Scheduled - Scheduled Maintenance: Helpdesk Portal Migration We will be carrying out scheduled maintenance on the Custodian Helpdesk Portal on Monday 1 June 2026 between 16:00 and 20:00 BST. During this window, the helpdesk portal may be unavailable while we migrate to a new system. Full details have been emailed to users with accounts on the portal. If you have not received the email, please check your junk or spam folder. If you still cannot find it, please contact our support team at [[email protected]](mailto:[email protected]). While the portal is unavailable, customers can still contact support by emailing [[email protected]](mailto:[email protected]) or calling +44 1622 230382. June 1, 2026 16:00 BST Active - Scheduled Maintenance: Helpdesk Portal Migration We will shortly be carrying out scheduled maintenance on the Custodian Helpdesk Portal. During this window, the helpdesk portal may be unavailable while we migrate to a new system. Full details have been emailed to users with accounts on the portal. If you have not received the email, please check your junk or spam folder. If you still cannot find it, please contact our support team at [[email protected]](mailto:[email protected]). While the portal is unavailable, customers can still contact support by emailing [[email protected]](mailto:[email protected]) or calling +44 1622 230382. June 1, 2026 20:00 BST Completed - Scheduled Maintenance: Helpdesk Portal Migration The scheduled maintenance has finished and the helpdesk portal has been migrated to the new system.

April 9, 2026 11:55 BST Scheduled - One of our third-party providers has advised that they need to perform maintenance at Goswell Road (GOS) which will impact our Dark Fibre link from Goswell Road (GOS) to Dartford (DA2). During this maintenance, we will have periods of reduced resiliency. The 3rd party engineers have identified a damaged section of cable in London that requires replacement, to avoid any further unplanned outages relating to the damage found. Custodian’s networking team will be working closely with the third party at all times. [Layer-3 IP Transit Services] Our core IP Transit network automatically re-routes all protected services when a fibre break is detected, and brings the failed fibre back into service only once it has been stable and error free for a period of time. As such, all Layer-3 services will have possible path switches at start and end of this work, depending on destination path selected, with potential changes in latency to some destinations, no significant disruption is expected to any IPT services at any location. [Layer-2 MPLS/VPLS Services] Standard Ethernet Services which have a path between GOSDA2 may experience an outage. Protected Ethernet Services which have a path between GOSDA2 may see a switch/re-route during this work; no significant disruption is expected. Diverse Ethernet Services which include a path between GOSDA2 may see the loss of one member; no parallel outages of both feeds are expected. [Wavelength Services] Services between GOSDA2 may experience an outage. This maintenance has been scheduled under ticket: [CDC-ID: #255923] April 15, 2026 21:00 BST Active - Scheduled maintenance is starting. April 16, 2026 04:00 BST Completed - Scheduled maintenance is complete.

April 8, 2026 12:00 BST Scheduled - One of our third-party providers has advised that they need to perform maintenance between Telehouse North (THN) and DA2. This will impact our Dark Fibre link from Telehouse North (THN) to Dartford (DA2). During this maintenance, we will have periods of reduced resiliency. This particular work by the 3rd party is to remake a badly degraded splicing-case that is leaving circuits vulnerable. Custodian’s networking team will be working closely with the third party at all times. [Layer-3 IP Transit Services] Our core IP Transit network automatically re-routes all protected services when a fibre break is detected, and brings the failed fibre back into service only once it has been stable and error free for a period of time. As such, all Layer-3 services will have possible path switches at start and end of this work, depending on destination path selected, with potential changes in latency to some destinations, no significant disruption is expected to any IPT services at any location. [Layer-2 MPLS/VPLS Services] Standard Ethernet Services which have a path between THNDA2 may experience an outage. Protected Ethernet Services which have a path between THNDA2 may see a switch/re-route during this work; no significant disruption is expected. Diverse Ethernet Services which include a path between THNDA2 may see the loss of one member; no parallel outages of both feeds are expected. [Wavelength Services] Services between THNDA2 may experience an outage. This maintenance has been scheduled under ticket: [CDC-ID: #255656] April 9, 2026 17:22 BST Completed - This maintenance event has now been cancelled by the third party. Once we are notified by the third party of a new date these will be published under a new maintenance event. For any additional queries please contact our NOC.

March 2, 2026 16:09 GMT Investigating - We have identified an interruption to a small selection of services to public upstream connections due to one of our own edge routers automatically resetting its NP. The automated reset clears the fault that the router identified but will have caused traffic to re-route to a different path while the route was unavailable. The event has fully recovered already and we are investigating the cause. At this time we do not expect any further interruptions as the automatic reset will have cleared any errors. March 2, 2026 18:06 GMT Resolved - We have seen no further evidence of errors appearing on the NP as such believe the system to be stable. We will continue to monitor this device closely.

February 28, 2026 10:12 GMT Monitoring - ME14 has seen a complete loss of 11kV supplies across all feeds due to two separate off-site high-voltage cable faults in the local area of Maidstone. CDC's UPS systems carried the load while all on-site generation started; and then transferred on to load as expected without any interruption to critical infrastructure. There is now an elevated risk level at ME14 while UKPN engineers work to resolve both cable faults and the site remains on local generation. CDC engineering staff on-site are closely monitoring. February 28, 2026 11:06 GMT Resolved - UKPN engineers have completed works to repair the supplies and we have seen the restoration of our 11kV feeders now. The site has cleanly transferred back from local generation to grid without interruption to critical load. The at-risk period is ending now.

January 6, 2026 09:46 GMT Scheduled - Feb 9th 07:00 – Feb 10th 18:00 Our dedicated maintenance team will be working with specialist contractors to undertake significant refresh works to our power infrastructure. These works are essential to maintain the reliance of our power infrastructure and will see increased redundancy and efficiency brought to DF1’s Critical Environment feeds. Between these dates, clients in Data Floor 1 (DF1) fed by UPS Dist 1 will be subject to an extended downtime of a SINGLE feed. Clients with correctly (dual A+B) cabled equipment should not suffer any loss of service but should consider the loss of redundancy during these works. All clients directly affected will be contacted by our Account Management team and our 24 hour team will be on hand throughout the period to offer any assistance required. If you are in DF1, and have not received an email from your Account Manager, please contact our support team. We will of course make every endeavour to keep the single feed downtime to an absolute minimum while maintaining operational safety and the highest levels of H&S. February 9, 2026 07:00 GMT Active - Scheduled maintenance is starting. February 10, 2026 12:08 GMT Completed - The maintenance is now completed.

January 6, 2026 09:44 GMT Scheduled - Feb 02nd 07:00 – Feb 3rd 18:00 Our dedicated maintenance team will be working with specialist contractors to undertake significant refresh works to our power infrastructure. These works are essential to maintain the reliance of our power infrastructure and will see increased redundancy and efficiency brought to DF1’s Critical Environment feeds. Between these dates, clients in Data Floor 1 (DF1) fed by UPS Dist 2 will be subject to an extended downtime of a SINGLE feed. Clients with correctly (dual A+B) cabled equipment should not suffer any loss of service but should consider the loss of redundancy during these works. All clients directly affected will be contacted by our Account Management team and our 24 hour team will be on hand throughout the period to offer any assistance required. If you are in DF1, and have not received an email from your Account Manager, please contact our support team. We will of course make every endeavour to keep the single feed downtime to an absolute minimum while maintaining operational safety and the highest levels of H&S. February 2, 2026 07:00 GMT Active - Scheduled maintenance is starting. February 3, 2026 16:01 GMT Completed - The maintenance is now finished.

January 6, 2026 09:41 GMT Scheduled - Jan 26th 07:00 – Jan 27th 18:00 Our dedicated maintenance team will be working with specialist contractors to undertake significant refresh works to our power infrastructure. These works are essential to maintain the reliance of our power infrastructure and will see increased redundancy and efficiency brought to DF1’s Critical Environment feeds. Between these dates, clients in Data Floor 1 (DF1) fed by UPS Dist 3 or 5 will be subject to an extended downtime of a SINGLE feed. Clients with correctly (dual A+B) cabled equipment should not suffer any loss of service but should consider the loss of redundancy during these works. All clients directly affected will be contacted by our Account Management team and our 24 hour team will be on hand throughout the period to offer any assistance required. If you are in DF1, and have not received an email from your Account Manager, please contact our support team. We will of course make every endeavour to keep the single feed downtime to an absolute minimum while maintaining operational safety and the highest levels of H&S. January 26, 2026 07:00 GMT Active - Scheduled maintenance is starting. January 27, 2026 07:18 GMT Completed - Maintenance work is completed

January 6, 2026 09:40 GMT Scheduled - Jan 19th 14:00 – Jan 20th 20:00 – our dedicated maintenance team will be working with specialist contractors to undertake significant refresh works to our power infrastructure. These works are essential to maintain the reliance of our Power infrastructure and will see increased redundancy and efficiency brought to DF1’s Critical Environment feeds. Between these dates, clients fed by UPS Dist 4 or 6 will be subject to an extended downtime of a singular feed. Clients with correctly (dual A+B) cabled equipment should not suffer any loss of service but should consider the loss of redundancy during these works. All clients directly affected will be contacted by our Account Management team and our 24 hour team will be on hand throughout the period to offer any Assistance required. We will of course make every endeavour to keep the single feed downtime to an absolute minimum while maintaining operational safety and the highest levels of H&S. January 19, 2026 14:00 GMT Active - Scheduled maintenance is starting. January 20, 2026 15:36 GMT Completed - This maintenance is now complete. No further disruptions relating to this work are expected. If you are still experiencing any issues, please contact our support team.

December 12, 2025 15:20 GMT Scheduled - Custodian’s Networking team have identified a hardware fault on one of our edge router platforms, we have been monitoring this device since its last reload and have decided to replace the line card on this router to resolve the NP fault. From our findings so far, this specific NP issue only occurs after a few or more weeks after a reset or reload of the NP. Given this, we are expecting there to be no further automatic NP reloads that will occur between today (12/12/25) and this maintenance window. Due to this being an edge router, the works to replace this hardware will not be service impacting to customers as we will cleanly remove it from service before replacing the hardware. If any impact to services were to be identified, these would only be due to network path re-routes round our core as the unit is cleanly decommissioned and then recommissioned on to its new hardware. Given the above, this is an at risk notification only. We do not expect customers to notice any impact to services. This maintenance is logged under [CDC-ID: #254870] For any queries regarding this window, please contact our NOC December 15, 2025 21:00 GMT Active - Scheduled maintenance is starting. December 16, 2025 06:00 GMT Completed - Scheduled maintenance is complete.