Cyber Security

Beyond Contracts: Proactive Cyber Security for UK Founders Managing Third-Party Software and Data Access

For UK founders, managing third-party software and data access extends far beyond initial contracts. Proactive cyber security involves understanding your own posture, strategic procurement, robust data sharing agreements, and continuous monitoring to safeguard

By Loom Workz Reviewed by Atahan 4 min read
Beyond Contracts: Proactive Cyber Security for UK Founders Managing Third-Party Software and Data Access

The short answer

UK founders can proactively manage cyber security risks from third-party software and data access by first understanding their own digital assets and risk posture. This involves strategic procurement processes that assess supplier security beyond features, ideally leveraging standards like Cyber Essentials. Crucially, establishing clear data sharing or processing agreements is vital to define roles and security measures. Continuous monitoring of third-party compliance, robust incident response planning, and ongoing staff awareness training further fortify defences. Resources like the NCSC's Cyber Action Toolkit offer tailored guidance for sustained resilience.

The Evolving Landscape of Third-Party Cyber Risk for UK Businesses

UK businesses, including founders and their teams, are increasingly reliant on third-party software, automation, and design providers. This reliance, while offering efficiency and innovation, also introduces significant cyber security vulnerabilities. Cyber attacks frequently exploit weaknesses within supply chains, affecting businesses of all sizes, making initial contracts merely the starting point for effective cyber security management.12

Recent figures underscore this growing threat, with 42% of small businesses in the UK reporting a cyber breach in 2024, and 32% of micro businesses experiencing phishing attacks specifically. Despite this increasing trend, many companies remain underprepared to protect their supply chains, with government data indicating only 13% of businesses have processes for reviewing immediate supplier cyber security risks. Global events can quickly translate into increased cyber risks for SMEs, making proactive measures critical.1234

Foundation First: Understanding Your Organisation's Cyber Security Posture

Before engaging third parties, UK founders must establish a strong understanding of their own cyber security posture. The critical first step involves identifying and cataloguing all digital assets, including data, devices, and systems that could potentially be accessed by external providers. This ensures that you know what needs protection before any third-party integration begins.5

Equally important is understanding your organisation's overall approach to cyber security risk management. This includes evaluating the specific risks your organisation is exposed to, identifying who is accountable for supply chain cyber security decisions, and establishing how risks are assessed and managed internally. Gaining this internal clarity forms the bedrock for secure third-party interactions.6

Strategic Procurement: Embedding Security from the Outset

Strategic procurement extends beyond assessing a supplier's product features to deeply evaluate their cyber security posture. The UK government-backed Cyber Essentials scheme serves as a vital baseline, protecting against approximately 80% of common cyber threats by ensuring five basic technical controls are in place. For UK businesses with a turnover under £20m, Cyber Essentials certification often includes free cyber-liability insurance and incident response support, highlighting its tangible benefits.78910

Furthermore, the National Cyber Security Centre (NCSC) provides 12 principles for supply chain security, guiding organisations to understand risks, establish control, check arrangements, and continuously improve. These principles are designed to help businesses effectively assess and gain confidence in their supply chains, moving through stages from initial planning to applying the approach to new and existing supplier relationships.111213

Data Sharing Agreements: The Legal and Practical Imperative

The Information Commissioner's Office (ICO) strongly recommends using data sharing agreements, even when not legally mandatory, to ensure clarity and demonstrate accountability under UK GDPR. These agreements are good practice as they clearly define the purpose of data sharing, outline what happens to the data at each stage, and set standards for security measures and handling data subject rights.141516

Essential components of such agreements include defining each party's role, specifying the personal data involved, outlining the lawful basis for sharing, and detailing obligations for compliance with data protection laws. Crucially, appropriate security measures must be in place, considering the nature, scope, context, and purpose of the sharing. It is important to distinguish between a data sharing agreement, which applies when sharing data with another controller, and a data processing agreement, needed when engaging a processor acting under your instructions.161718

Ongoing Management: Continuous Oversight and Improvement

Effective third-party cyber security demands continuous monitoring beyond initial onboarding. Organisations should regularly review supplier compliance with agreed security requirements and contractual terms, tracking and analysing external threats. Additionally, robust incident response and recovery plans are essential, specifically accounting for third-party involvement and their access to data, with regular testing and improvement of these plans.1920

Staff awareness is a critical defence layer; employees must be trained to recognise phishing attempts and understand their role in maintaining security, particularly concerning interactions with third parties. For UK small businesses, the NCSC's free Cyber Action Toolkit offers a practical starting point, providing tailored guidance and step-by-step actions to build cyber resilience both internally and across supply chains, focusing on high-impact, low-effort actions.

Sources

  1. Supply Chain Security: The Unseen Cyber Risk in Your Business | Infosecurity Magazine Infosecurity Magazine
  2. Cyber Security for SMEs: Why It Matters Now More Than Ever Panorays
  3. Cyber attacks on UK small businesses and how to protect your SME | Lloyds Bank Lloyds Bank
  4. Small Business Cyber Security: Is Your Business Exposed to Risk? Continuity
  5. 5 Key Steps to Cyber Supply Chain Risk Management (SCRM) | Bitsight Bitsight
  6. Complying with NCSC Supply Chain Cyber Security Guidance | Prevalent Mitratech
  7. NCSC Playbook Embeds Cyber Essentials in Supply Chains | Infosecurity Magazine Infosecurity Magazine
  8. PPN 014: Cyber essentials scheme (HTML) - GOV.UK GOV.UK
  9. Cyber Essentials certification: guidance for small and medium-sized enterprises - GCA GCA
  10. How the Cyber Security Standard Affects Government Tender Bids | Amtivo Amtivo
  11. 7 Steps to Adopt NCSC's New Supply Chain Security Guidance | Panorays Panorays
  12. Updates to the Cyber Essential Scheme | Procurement Pathway Procurement Pathway
  13. Cyber supply chain security - NCSC.GOV.UK NCSC
  14. Data sharing agreements - ICO Information Commissioner's Office
  15. Data sharing: a code of practice - ICO Information Commissioner's Office
  16. New Statutory Guidance on Data Sharing - Cornerstone Barristers Cornerstone Barristers
  17. When and why your business needs a data sharing agreement - Harper James Solicitors Harper James Solicitors
  18. Data Sharing Agreement | Data Sharing Between Controllers - Culbert Ellis Culbert Ellis
  19. 5 Key Steps to Cyber Supply Chain Risk Management (SCRM) | Bitsight Bitsight
  20. Cyber resilience: integrating IT risk into business strategy HCLTech

Sources last checked 10 October 2026.