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    ContractsLegacy Defence Applications Support and Transition Services
    Open tender

    Legacy Defence Applications Support and Transition Services

    Contract value
    £295m
    Published 1 Sept 2026

    Provide sustained support and managed transition services for Defence's legacy applications portfolio while enabling progressive modernisation and system retirement.

    🇬🇧United Kingdom· South WestPublished 1 Sept 2026· 2 months agoviaFind a Tender
    Contract value
    £295m
    Published 1 Sept 2026

    Decision brief

    4 fields
    • Contract value
      £295,000,000indicative
      Pounds sterling
    • Closing date
      Rolling
      No closing date published
    • Sector
      IT & Software
      Browse related listings
    • Location
      🇬🇧United Kingdom
      South West

    Lifecycle

    Open

    Open tender — no closing date published. Opened 2 months ago.

    1 September 2026
    Open tender · no closing date published

    Brief

    The Authority is seeking a supplier to provide comprehensive sustainment and support services for a portfolio of legacy Defence applications that support critical logistics, inventory management, engineering, munitions, maritime, and supply chain operations. The supplier will deliver service management, application support and maintenance, incident and problem management, configuration and release management, technical assurance, cyber security support, middleware and integration services, and data management. The role includes supporting business-critical systems while enabling a controlled transition and modernisation programme, including data migration, systems integration, knowledge transfer, and decommissioning activities. The supplier must maintain service availability, performance, security, and resilience across an interconnected application estate that will progressively reduce in scope as replacement capabilities are introduced over the contract term.

    Track record

    4 awards · 4 winners
    Open field

    No single supplier dominates the field.

    In it software, Defence Equipment and Support has awarded 4 contracts to 4 suppliers.

    Who wins here
    1. Enterprise Services Defence and Security UK Ltd1× · 25%
    2. Aireon LLC1× · 25%
    3. DECISION ANALYSIS SERVICES LIMITED1× · 25%
    4. EntServ UK Limited1× · 25%

    Across it software, the most active winners are SOFTCAT PLC, PHOENIX SOFTWARE LTD, INSIGHT DIRECT UK LIMITED — the field to beat, or your route in as a partner.

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    Take action
    View tender on sourceFind a Tender

    Full notice and submission process on the publisher's site

    Publisher
    UK Cabinet Office
    Licence
    OGL v3.0
    Source
    find-tender.service.gov.uk
    Record ID
    ocds-h6vhtk-06ef8e

    Track

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    Your fit

    Could you win this?

    A straight answer for your business — bid, partner or pass — based on who wins Defence Equipment and Support's work like this.

    4 awards · 4 firms

    Check my fit

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    DE
    Buyer
    Defence Equipment and Support
    Sector
    IT & Software