---
title: "Preliminary Market Engagement - Sellafield Limited: Network Services"
ocid: "ocds-h6vhtk-078dc7"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-078dc7"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-078dc7.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-078dc7.json"
source: "Find A Tender Service"
current_stage: "Planning"
buyer: "Sellafield Ltd"
published: "2026-10-22"
---

# Preliminary Market Engagement - Sellafield Limited: Network Services

Buyer: Sellafield Ltd  
Current stage: Planning  
OCID: ocds-h6vhtk-078dc7

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## Summary

Sellafield Limited is planning to procure network and communications services for its estate in Warrington and Cumbria. The scope covers external connections to networks and data centres, including internet, satellite and voice links; local and wireless networks; data-centre networking and managed wide-area networks; and shared infrastructure such as addressing, routing, load balancing and time services. It also includes network access control and security, enterprise voice services from VoIP and contact centres to plant-critical telephony, and standalone broadband and telephone services. The supplier is expected to operate and maintain network services, including a network operations centre, and may provide projects, hardware, software and management of third-party contracts. The work spans corporate, operational technology and business-critical applications. It is network services (CPV 32400000).

This is at the planning and preliminary market engagement stage: Sellafield is seeking supplier feedback through a Request for Information to test market capability and capacity, validate or refine requirements, and shape its procurement strategy. The buyer expects to run a competitive call-off under the Network Services 4 framework, using its internet connectivity, local connectivity, and voice and unified communications lots. It anticipates launching the competition in July 2027. The planned contract period runs from 1 July 2028 to 30 June 2035. The estimated value is £75 million excluding VAT (£90 million including VAT). Suppliers wishing to provide feedback are asked to submit it through Atamis by 12 November 2026 at 23:59 GMT; this is the engagement response deadline, not a tender deadline. No award criteria are set out at this stage.

This future requirement is suited to established network service providers able to deliver and integrate connectivity, data, voice and security services across a large, complex estate. Relevant capabilities include MPLS, data-centre interconnects, internet and satellite connectivity; LAN, wireless and managed WAN; network routing, security, traffic management and application delivery; and resilient shared infrastructure. Suppliers should be able to provide enterprise telephony, including VoIP, analogue, contact-centre and plant-critical services, alongside broadband and standalone voice services. The scope also favours providers with the operational capacity to run a network operations centre and handle administration, planning, integration, maintenance and service management. The buyer is also considering project delivery, supply of hardware and software, and management or replacement of third-party contracts. Its market engagement is intended to understand suppliers’ capabilities and capacity; detailed qualifications and accreditations are not yet set out.

## Notice

Sellafield Ltd is considering a call for competition for Network Services under the Network Services 4 (NS4) Framework Agreement (RM6377) Lot 1 Internet Connectivity Services (WAN), Lot 2 Local Connectivity Services (LAN), and Lot 3 Voice and Unified Communications. We anticipate launching this call for competition in July 2027. Sellafield Ltd is undertaking Preliminary Market Engagement to provide suppliers with an understanding of the Network Services opportunity and inviting feedback through a Request for Information (RFI), on key aspects of the requirement. The information gathered will help Sellafield Ltd assess market capability and capacity, validate and, where appropriate, refine its requirements, and inform its procurement strategy and approach. The proposed scope of the Network Services is as follows: External Connectivity The provision of circuit only connectivity from internal Sellafield networks to external networks and data centres including MPLS, DCI, internet, satellite and SIP connectivity. Corporate Data Services The provision of local, wireless, data centre networking and managed WAN overlay services supporting corporate, operational technology and business-critical applications across the Sellafield estate, including connectivity, routing, security, traffic management, application delivery and WAN management. Core Network Services The provision of shared network infrastructure services enabling secure and resilient operation of the Sellafield estate, including IP address allocation and management, network configuration, load balancing and time services. Network Security Services The provision of network-based access control, threat protection and gateway security services for users, devices, applications and internet connectivity across the Sellafield estate. Enterprise Telephony Services The provision of enterprise-wide voice communications services, encompassing, VoIP, analogue, contact centre and plant critical telephony alongside integrated voice applications and voice gateway services for connectivity to external voice networks and platforms. Standalone Services The provision of standalone, ad-hoc voice and data services, including fibre to the cabinet, (FTTC), fibre to the premises (FTTP) and single order ADSL (SOADSL) broadband connectivity and telephony services. Network Operations, Planning and Management The provision of network administration, planning, integration and management services and the setup, management, maintenance and operation of a network operations centre (NOC) to operate the Network Services. Optional Services In addition to the baseline services and agreed service instructions, the supplier shall provide optional services, including the delivery of projects and the provision of hardware and software, where required by Sellafield. Third-Party Contract Management The provision of new third-party contracts necessary for the provision of the Network Services where required by Sellafield. This shall also include acting as an agent, to manage and operate third-party contracts on behalf of Sellafield or novate or replace existing third-party contracts where required by Sellafield.

### Planning Information

Sellafield Ltd is conducting this Request for Information (RFI) to offer potential participants the opportunity to engage with Sellafield Ltd to better understand the contract opportunity and provide feedback. This feedback will inform and shape the procurement of the Network Services. 
To obtain further information and provide feedback, suppliers must register their interest via the Nuclear Decommissioning Authority and Sellafield Ltd E-procurement system, Atamis. 
This can be found at the following address: https://atamis-2464.my.site.com/s/Welcome.  
Upon registration on Atamis, suppliers will be able to access all relevant documentation and submit their feedback using record reference “C32984, Preliminary Market Engagement – Network Services”. The deadline for submissions is at 23:59 GMT on 12 November 2026.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/099945-2026 |
| Notice type | UK2 - Preliminary Market Engagement Notice |
| Procurement type | Framework |
| Procurement category | Services |
| Procurement method | Selective |
| Procurement method details | Award under framework |
| Tender suitability | Not specified |
| Awardee scale | Not specified |
| All stages | Planning |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 22 Oct 2026 |
| Submission deadline | Not specified |
| Future notice date | 1 Jul 2027 |
| Award date | Not specified |
| Contract period | 1 Jul 2028 - 30 Jun 2035 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £75,000,000 |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Planned |
| Lots status | Planned |
| Awards status | Not specified |
| Contracts status | Not specified |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | Sellafield Ltd |
| Locality | WARRINGTON |
| Postcode area | Warrington |
| Postcode | WA3 6GR |
| Country | England |
| ITL 1 | TLD North West (England) |
| ITL 2 | TLD6 Cheshire |
| ITL 3 | TLD61 Warrington |
| Local authority | Warrington |
| Electoral ward | Birchwood |
| Westminster constituency | Warrington North |
| Delivery location | TLD11 West Cumbria, TLD61 Warrington |

## CPV Codes

### Divisions

- 32 - Radio, television, communication, telecommunication and related equipment
- 45 - Construction work
- 50 - Repair and maintenance services
- 64 - Postal and telecommunications services
- 72 - IT services: consulting, software development, Internet and support

### Codes

- 32400000 - Networks
- 32420000 - Network equipment
- 32429000 - Telephone network equipment
- 32551400 - Telephone network
- 32552100 - Telephone sets
- 45314200 - Installation of telephone lines
- 50334110 - Telephone network maintenance services
- 64210000 - Telephone and data transmission services
- 64211000 - Public-telephone services
- 64213000 - Shared-business telephone network services
- 64215000 - IP telephone services
- 72700000 - Computer network services
- 72710000 - Local area network services
- 72720000 - Wide area network services

## Release History

- 22 Oct 2026 at 12:29 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/099945-2026
- 22 Oct 2026 at 12:06 - Planning - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/099923-2026

## Documents

- https://www.find-tender.service.gov.uk/Notice/099945-2026
  22nd October 2026 - Preliminary market engagement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/099923-2026
  22nd October 2026 - Pipeline notice on Find a Tender

## Notice URLs

- https://atamis-2464.my.site.com/s/Welcome
- https://www.gov.uk/government/organisations/sellafield-ltd
- https://www.legislation.gov.uk/ukpga/2023/54/contents

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-078dc7. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-078dc7.json.