UK cloud dependence creates £1bn outage risk, report warns

A recent analysis reveals that the UK’s growing dependence on cloud infrastructure has created significant economic exposure to potential outages. More than 60% of British companies now use cloud services for essential operations, with that figure rising to over 80% among FTSE 100 firms. This concentration of risk in a handful of providers and regions could lead to substantial financial losses if disruptions occur, according to the findings from the Cyber Monitoring Centre, a nonprofit research group, in collaboration with digital infrastructure insurer Parametrix.

The report, The Cost of Downtime: UK Exposure to Cloud Infrastructure Failure, identifies specific cloud regions as critical failure points for the UK economy. Amazon Web Services’ (AWS) European region in Dublin (eu-west-1) and its primary U.S. region in Northern Virginia (us-east-1) are highlighted as particularly high-risk. A 24-hour outage in either region could result in revenue losses of £1 billion and £650 million, respectively, for UK businesses. These estimates account only for direct losses among cloud users, excluding broader supply chain impacts.

Concentrated risk in hyperscale providers

The report underscores that 80% of UK cloud-dependent businesses rely on just three providers: AWS, Microsoft Azure, and Google Cloud. This concentration extends to geographic regions, with half of FTSE 100 companies dependent on UK and Ireland cloud regions, while smaller firms show even greater reliance on these areas. The findings suggest that multi-cloud strategies may not fully mitigate risk, as many organizations still centralize critical workloads in a limited number of regions, creating operational complexity without diversifying exposure.

A real-world example cited in the report is the October 2025 AWS outage in the us-east-1 region, which disrupted services for UK-based organizations, including Lloyds Banking Group and government agencies. The incident stemmed from a flaw in the DNS management system for DynamoDB, which cascaded through dependent AWS services. While AWS has since pledged to improve resilience, the report notes that many companies lack visibility into their cloud dependencies, such as which providers, regions, or services underpin their revenue-generating operations.

Calls for coordinated action

The Cyber Monitoring Centre argues that cloud infrastructure should now be treated as critical national infrastructure, requiring coordinated efforts from businesses, insurers, regulators, and policymakers. Will Mayes, CEO of the Cyber Monitoring Centre, stated that the goal is not to reduce cloud adoption but to recognize its systemic importance and implement appropriate governance and investment strategies.

"This isn’t about stepping back from the cloud; it’s about recognizing that cloud is now part of our critical infrastructure and designing, governing, and investing accordingly." — Will Mayes, CEO, Cyber Monitoring Centre (The Register - Off-Prem)

The report also highlights broader concerns about the UK’s reliance on U.S.-based cloud providers, particularly in the public sector. Earlier this year, another study warned that dependence on American tech companies could pose security risks due to the U.S. CLOUD Act, which allows law enforcement to access data stored by U.S. providers regardless of location. Additionally, geopolitical tensions could theoretically disrupt access to these services, further complicating the UK’s cloud strategy.

What to watch

The findings raise questions about whether current resilience measures are sufficient to address the risks of concentrated cloud dependence. Companies are advised to audit their cloud footprints to identify single points of failure and assess whether multi-cloud or multi-region strategies genuinely distribute risk or merely add complexity. Regulators may also face pressure to introduce guidelines for cloud resilience, particularly for sectors deemed critical to national economic stability.