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Their own payment-practices filing · gov.uk

How long does National Nuclear Laboratory Limited take to pay its suppliers?

CRN 03857752 · Professional & technical services · 16 statutory reports on record · period to 31 Mar 2026

12days
their reported average time to pay suppliers, latest period
Faster than mostvs a 31-day median across 6,185 recent filers

Self-reported figure from their statutory filing. How this is compiled.

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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
0 outstanding charges on the register Accounts due 30 Jun 2027

Open the full record at Companies House.

Terms vs reality

Stated terms: 0–61 days. Reported average: 12.

Stated terms0–61d
+12 days
Reported avg12d

At a glance

The key figures

0–61d
their stated terms
13%
invoices paid outside terms
+3d
slower over the window
±2d
steady pattern

Vs peers · latest reported averages

fasterslower
Faster than 93% of the 530 large companies reporting in professional & technical services.

The pattern

Getting slower

Average days to pay across their last 6 statutory reports.

9
9
8
8
10
12
H2 2023H1 2024H2 2024H1 2025H2 2025H1 2026

Where their supplier invoices land · latest period

within 30 days 93% 31–60 days 7% 61+ days 0%

The read · computed from their figures

National Nuclear Laboratory Limited has filed 16 statutory payment periods (earliest H2 2018). Their latest report puts the average at 12 days against stated terms of 0–61 days.

The direction is slower: from 9 to 12 days over the window — about 3 days slower.

In the latest period 13% of invoices were paid outside their agreed terms, and 0% landed 61+ days out.

What they tell their suppliers

Payment code: UKNNL follows the Prompt Payers Code of Practice

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.

PeriodAvg daysOutside terms61+ daysFiled
H1 20261213%0%28 Apr 2026
H2 2025101%0%29 Oct 2025
H1 202582%0%2 May 2025
H2 202483%0%29 Oct 2024
H1 202493%0%24 Apr 2024
H2 202392%0%27 Oct 2023
H1 202372%0%17 May 2023
H2 202272%0%31 Oct 2022
H1 202272%0%29 Apr 2022
H2 202184%0%15 Oct 2021
H1 202173%1%30 Apr 2021
H2 202085%0%20 Oct 2020
H1 202073%1%27 Apr 2020
H2 201994%1%17 Oct 2019
H1 2019107%1%30 Apr 2019
H2 2018107%1%31 Oct 2018

Working-capital effect

What a 12-day cycle ties up

Illustrative. On a hypothetical £12k/month account, at a 12-day vs a 0-day payment cycle.

≈ £4,500
of invoicing outstanding at any one time on a 12-day cycle — about £4,700 more than the same account would carry at 0-day terms.

Late Payment Act. The Late Payment of Commercial Debts Act lets a supplier charge statutory interest and fixed compensation on invoices paid past agreed terms. Work out what a late invoice is worth → Whether it applies depends on your contract — check with an adviser.

Quick answers

Are they getting slower or faster?
Their reported average has moved about 3 days slower over the window (9 → 12 days).
What's their typical pay point?
Their latest reports average around day 12, moving within about ±2 days. Treat that as a historical reference point, not a promise for a new invoice.
Can I see what this means for my invoices?
Run the live check — it re-reads their record and their live Companies House file, on the amount you invoice.

Stay ahead

Watch National Nuclear Laboratory Limited (free)

Their next payment report is due ≈ 27 Oct 2026. We watch their public record and email you when something changes — a new payment report, late filings, insolvency markers, new charges.

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How UK payment reporting works

What is a Payment Practices Report?
UK companies and LLPs above a size threshold — broadly, two of: turnover over £54m, balance sheet over £27m, or more than 250 employees — must report twice a year, under the Reporting on Payment Practices and Performance Regulations 2017, how quickly they actually pay suppliers: the average time to pay, the share of invoices paid in 30 days or fewer, 31 to 60 days and 61 days or longer, and their standard payment terms. Those thresholds apply to financial years beginning on or after 6 April 2025; for earlier financial years they were £36m and £18m, with the same 250-employee test.
What does "paid outside agreed terms" mean?
The share of invoices paid later than the terms in the supplier contract. If terms are 30 days and an invoice is paid on day 45, it counts as paid outside terms, regardless of the headline average.
How often is this data updated?
Each report covers a six-month period and must be filed within 30 days of that period ending, so a company's record refreshes roughly twice a year. PaidLate re-reads the register as new reports are filed.
Is this official government data?
The underlying payment figures come from the company's own statutory filings on the gov.uk payment-practices service; company-status data comes from Companies House. PaidLate calculates trends, comparisons and summaries from those records. It does not use surveys or credit-agency scores.

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 6,185 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

Verify the original Companies House file

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