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CPT_26_39 Specialist model assurance support

National Audit Office

This public procurement record has 1 release in its history.

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26 Aug 2026 at 13:38

Award Notice
Summary of the contracting process

The National Audit Office procured specialist model assurance support as an auditing service. The appointed supplier will oversee and lead testing of a subset of models within the National Audit Office’s model assurance portfolio. The work is delivered in the United Kingdom and concerns the assurance of models rather than general audit provision. This is relevant to firms providing independent model testing, validation, assurance leadership or related accounting and auditing services, particularly those able to manage work across a portfolio of models. The buyer is the National Audit Office, the UK public body responsible for scrutinising public spending. The requirement was classified under CPV 79210000 for accounting and auditing services.

The procurement is complete and was awarded on 1 August 2026 to Hartley McMaster Limited. It used a selective call-off from the Crown Commercial Service GCloud 14 framework. The contract value is £336,000 including VAT for the full four-year term. The initial contract runs from 4 January 2027 to 3 January 2030, with an option at the National Audit Office’s discretion to extend for up to 12 months, ending on 3 January 2031. The tender submission deadline was 1 June 2026 at 12:00 BST. The contract was awarded to one supplier, and the procurement was identified as suitable for small and medium-sized enterprises and voluntary, community and social enterprises.

This award provides a clear example of the National Audit Office’s demand for specialist model assurance through a public-sector framework. A credible future competitor would need to lead structured testing of selected models, manage assurance activity across a wider portfolio and provide evidence-based findings that an audit body can rely on. Relevant strengths include technical model validation, independent challenge, risk assessment, quality assurance and the ability to communicate testing results clearly to senior stakeholders. Firms with experience in accounting, auditing, public-sector assurance or regulated environments are likely to be well placed, as are smaller specialist consultancies able to deliver focused expert support. Familiarity with framework call-offs and the governance expected by the National Audit Office would also strengthen a supplier’s position.

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Notice Information

Notice Title

CPT_26_39 Specialist model assurance support

Notice Description

The National Audit Office awarded a contract to Hartley McMaster Limited through the Crown Commercial Services GCloud 14 framework. The supplier will oversee and lead the testing of a subset of models within the NAO model assurance portfolio. The contract will commence on Monday 4 January 2027 and run for an initial period of three years until Thursday 3 January 2030. At the NAO's discretion, the contract may be extended by up to 12 months, until Friday 3 January 2031. The estimated contract value is PS336,000 inclusive of VAT over the full four-year term.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-b5fd17-6bc5942d-7e5a-4ed2-900c-ae594f9e9562
Publication Source
Contracts Finder
Latest Notice
https://www.contractsfinder.service.gov.uk/Notice/ac06dc1e-2908-4a2f-8b6b-286917e5d412
Current Stage
Award
All Stages
Award

Procurement Classification

Notice Type
Award Notice
Procurement Type
Framework
Procurement Category
Services
Procurement Method
Selective
Procurement Method Details
Call-off from a framework agreement
Tender Suitability
SME, VCSE
Awardee Scale
SME

Common Procurement Vocabulary (CPV)

CPV Divisions

79 - Business services: law, marketing, consulting, recruitment, printing and security

CPV Codes

79210000 - Accounting and auditing services

Notice Value(s)

Tender Value
£336,000 £100K-£500K
Lots Value
Not specified
Awards Value
£336,000 £100K-£500K
Contracts Value
Not specified

Notice Dates

Publication Date
26 Aug 2026Yesterday
Submission Deadline
1 Jun 2026Expired
Future Notice Date
Not specified
Award Date
1 Aug 20263 weeks ago
Contract Period
4 Jan 2027 - 3 Jan 2031 4-5 years
Recurrence
Not specified

Notice Status

Tender Status
Complete
Lots Status
Not Specified
Awards Status
Active
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
National Audit Office
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
SW1W 9SP
Postcode Area
South West London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI3 Inner London - West
Small Region (ITL 3)
TLI35 Westminster and City of London
Delivery Location
Not specified
Local Authority
Westminster
Electoral Ward
Pimlico North
Westminster Constituency
Cities of London and Westminster

Supplier Information

Number of Suppliers
1
Supplier Name

Hartley McMaster Limited

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts.

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