Their own payment-practices filing · gov.uk
National Nuclear Laboratory Limited pays suppliers in 12 days on average — inside its 61-day stated terms
Their H1 2026 filing puts the average 49 days inside their stated 61-day term.
- Their stated terms
- 61 days
- Paid outside agreed terms
- 13% of invoices
- Paid after 61+ days
- 0%
- Reporting period
- 1 Oct 2025 – 31 Mar 2026
- Source
- their gov.uk filing, filed 28 Apr 2026
Self-reported figures from their statutory filing. How this is compiled.
Terms vs reality · their H1 2026 filing
Paid 49 days inside the 61-day term they state
Where their invoices landed · share of all invoices
The pattern · last 6 of 16 reports
9 → 12 days — slowing down
The read · computed from their figures
National Nuclear Laboratory Limited's H1 2026 filing puts their average at 12 days against stated terms of 61 days; 13% of invoices were paid outside agreed terms and 0% took 61 days or longer. Filed 28 Apr 2026.
The direction is slower: from 9 days in H2 2023 to 12 now — 3 days slower across their last 6 reports.
On the latest reported averages: Faster than 93% of the 510 large companies reporting in professional & technical services.
That is 16 statutory periods on record (earliest H2 2018) — a historical record, not a promise for a new invoice.
What they tell their suppliers
In their own words · from the filing
Standard payment terms
UKNNL uses a Procurement card to settle a significant proportion (42.52%) of its supply chain purchases immediately. Where credit terms are operated our standard practice is to pay undisputed valid invoices within 30 days of receipt. However, variations to these terms do exist based on agreements with certain suppliers which were in place prior to UKNNL becoming a Contracting Authority on 1 April 2017. Supplier payments are processed weekly.
Dispute resolution
The company is committed to dealing with its suppliers in a fair, honest and professional manner while seeking best value for the business. We seek to resolve queries as quickly as possible to everyone's satisfaction prior to payment falling due. In the event that a dispute cannot be resolved by our Accounts Payable team, it would be escalated in the first instance to the relevant Head of Department to seek resolution.
Every statutory report on record
Most recent first.
| Period | Avg days | Outside terms | 61+ days | Filed |
|---|---|---|---|---|
| H1 2026 | 12 | 13% | 0% | 28 Apr 2026 |
| H2 2025 | 10 | 1% | 0% | 29 Oct 2025 |
| H1 2025 | 8 | 2% | 0% | 2 May 2025 |
| H2 2024 | 8 | 3% | 0% | 29 Oct 2024 |
| H1 2024 | 9 | 3% | 0% | 24 Apr 2024 |
| H2 2023 | 9 | 2% | 0% | 27 Oct 2023 |
| H1 2023 | 7 | 2% | 0% | 17 May 2023 |
| H2 2022 | 7 | 2% | 0% | 31 Oct 2022 |
| H1 2022 | 7 | 2% | 0% | 29 Apr 2022 |
| H2 2021 | 8 | 4% | 0% | 15 Oct 2021 |
| H1 2021 | 7 | 3% | 1% | 30 Apr 2021 |
| H2 2020 | 8 | 5% | 0% | 20 Oct 2020 |
| H1 2020 | 7 | 3% | 1% | 27 Apr 2020 |
| H2 2019 | 9 | 4% | 1% | 17 Oct 2019 |
| H1 2019 | 10 | 7% | 1% | 30 Apr 2019 |
| H2 2018 | 10 | 7% | 1% | 31 Oct 2018 |
On the public register · Companies House
Company record
- Status
- Active
- Type
- Private Limited Company
- Incorporated
- 7 Oct 1999
- Registered office
- CHADWICK HOUSE WARRINGTON ROAD, WARRINGTON, WA3 6AE
Quick answers · National Nuclear Laboratory Limited
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How UK payment reporting works
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How often is this data updated?
Is this official government data?
How this is compiled. Built from official records only: Companies House and the gov.uk payment-practices service. The payment figures are self-reported — companies over the size threshold must file them by law and the board signs them off. No credit-agency data. The numbers are theirs; the plain-English read is ours. This is information compiled from public records under the Open Government Licence v3.0 — not a credit rating and not advice.
The 31-day comparison figure is the median across 6,104 companies with a current statutory report — every sector pooled, not an average of sector medians (how the figure is built).
Report PL-03857752 · latest period to 31 Mar 2026
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