A Roadmap to Public Sector IT Modernisation

When a ransomware attack shut down a pathology provider in 2024, over 10,000 NHS appointments were delayed. Behind the headlines? A legacy system that hadn’t been patched in years.

As public sector organisations strive to meet rising citizen expectations, embrace digital transformation, and operate within tighter budgetary and regulatory constraints, they encounter a complex mix of pressures that demand technical know-how, agility, and resilience.

Reports from the National Audit Office and various cyber security bodies paint a clearer picture on this still, with some suggesting that public sector IT in the UK is dangerously outdated and under-resourced,  both caused by and leading to ongoing issues, such as:

Legacy infrastructure
A significant portion of public sector IT (the reports linked above indicate as much as 30%+ in central government and 70% in some NHS trusts) is outdated and vulnerable. Maintaining this infrastructure drains resources and prevents organisations from leveraging newer, more secure technologies.

Cyber threats
Government systems are increasingly targeted by ransomware, phishing campaigns, and nation-state actors. Many legacy systems still remain far too vulnerable today, with estimates suggesting that more than two-hundred systems in government IT estates lack proper cyber assessments.

The cyber security skills shortage
Over one-third of government cyber roles remain vacant or temporarily staffed. Departments can struggle to attract and retain skilled personnel due to salary disparities with the private sector.

AI integration risks
AI tools such as Microsoft Copilot are being tested across civil service departments to optimise, enhance, and automate workflows. While beneficial, the integration of AI raises questions around data security, regulatory compliance, and ethical oversight that have yet to be fully addressed inside existing governance frameworks.

Regulatory and policy gaps
Despite national strategies designed to standardise regulatory practices (e.g., the Government Cyber Security Strategy 2022–2030), implementation still varies widely across public sector departments. Some organisations lack the resources or know-how to meet baseline security standards, and this is worsened when managing legacy systems or integrating cloud-based services.

Budget constraints
Cost pressures have led to cutbacks in cyber security and IT, as well as stalling efforts to upgrade and transform infrastructure. In the UK, these financial constraints are particularly acute. Many departments are operating with limited budgets while facing rising expectations for digital service delivery and cyber resilience. This underinvestment not only increases the risk of service disruption and data breaches but also widens the gap between policy ambition and operational reality.

The legacy burden

Public sector IT estates are often a patchwork of old systems, custom-built applications, and ageing infrastructure, with some dating back two or three decades!

Along with slowing down work, these systems come with other, pressing issues, including:

High operating costs
Legacy systems require increasing maintenance, specialist skills, and bespoke support contracts, diverting funds away from innovation.

Security vulnerabilities
Old systems may lack encryption, modern authentication mechanisms, and are often unsupported by vendors, making them prime targets for cyber-attacks.

Poor user experience
Legacy applications are often slow, non-mobile-friendly, and inconsistent across departments, frustrating both users and service recipients.

Data silos/integration challenges
Many systems were not designed to integrate with modern platforms, leading to fragmented data, duplication, and poor decision-making.

Skills shortage
The skills required to maintain ageing systems are disappearing from the workforce, further increasing risk and cost.

Regulatory compliance gaps
Legacy systems can struggle to meet modern standards for data protection, accessibility, and service transparency.

The above challenges not only compromise operational efficiency but also prevent public bodies from capitalising on digital transformation opportunities, such as AI, automation, and data-driven policymaking. Sadly, this is a huge obstacle against progress, and public sector organisations risk falling further behind as time goes on.

A roadmap for modernisation

[textframe] So, how to help? 

Well, for many public sector bodies, transitioning away from legacy systems is complex (particularly when services are critical to public wellbeing or governed by legal mandates). Success requires a phased, strategic roadmap supported by leadership buy-in and realistic timelines.

Partnering with a trusted IT provider that understands the unique challenges of the public sector can make all the difference. With the right expertise, organisations can navigate regulatory requirements, mitigate risk, and modernise with confidence – all without compromising service continuity or security.

A clear roadmap to modernisation will usually include the following steps:  

Establish clear ownership and governance
Start by assigning dedicated programme ownership, ideally through a cross-functional team that includes IT, procurement, service leads, and compliance officers. This ensures that the project aligns with operational needs and adheres to public sector standards.

Audit and categorise systems
Conduct a thorough audit of your current IT estate. Classifying systems based on:

• Criticality to operations 
• Risk profile (e.g., security, vendor support, data sensitivity) 
• Integration dependencies 
• Cost of maintenance 
• User feedback and service experience

This information can be used to prioritise which systems to replace, re-platform, retire, or retain.

Design with the future in mind
Avoid ‘lifting and shifting’ outdated processes into new systems. Instead, use modernisation as an opportunity to:

• Consolidate duplicate applications 
• Standardise workflows 
• Adopt cloud-native architectures where feasible 
• Introduce automation and data sharing between departments

Modernisation also presents a valuable opportunity to embed emerging technologies like artificial intelligence and machine learning into the organisation. These tools can streamline routine administrative tasks, freeing up public servants to focus on higher-value and more creative work. Predictive analytics can enhance decision-making by offering data-driven insights into service demand, resource allocation, and risk management. Meanwhile, AI-powered chatbots and virtual assistants can improve citizen engagement by delivering 24/7 support and personalised responses – all capabilities that legacy systems simply can’t match.

I believe your IT partner will play a crucial role during this stage; bringing cross-sector experience gained from both public and private sectors to the table, advising on best-fit, technologies, and ensuring interoperability with existing systems while building scalability into future platforms.

Focus on data migration and quality early
Data migration is often the riskiest part of legacy replacement, and it will be important to invest in data cleaning, classification, and mapping up front. At this time, it may be worth considering establishing a centralised data governance framework to ensure consistency and compliance going forward.

Adopt agile, iterative approaches
Large, multi-year programmes that attempt a full replacement often fail. Instead, adopt modular rollouts with measurable milestones and follow-up for continual improvement. It’s important to engage users early and often to validate new systems and refine features.

Plan for change management and training
Modern systems change how services are delivered and how staff work. Invest in change management, communication campaigns, and tailored training to ensure adoption and minimise disruption.

[/textframe]

Final word: the benefits of modernisation

It’s true that modernising legacy systems unlocks far-reaching benefits – from faster, more user-friendly services and stronger security, to improved decision-making and long-term cost savings.

Still, legacy systems are no longer just outdated – they’re a liability. Continuing to rely on them exposes organisations to rising costs, cyber threats, and operational inefficiencies, some of which could devastate the public services we rely on and put the country’s critical infrastructure at risk.

For the public sector, modernisation isn’t optional: it’s a moral obligation. Citizens deserve secure, efficient, and accessible services, and organisations have a duty to deliver them.

The good news? Modernisation doesn’t have to be overwhelming. With a clear roadmap and the support of a trusted IT partner who understands the unique challenges of the public sector, agencies can modernise with confidence.

Now is the time to move from patching and firefighting to transforming and thriving. To find out more about our work with the public sector, and how we can help your organisation level-up, please get in touch.