Their own payment-practices filing · gov.uk

SP Transmission PLC pays suppliers in 35 days on average — within its stated 30–60 day terms

CRN SC189126 · Electricity & gas · 17 statutory reports on record · period to 30 Jun 2026

35daysavg time to pay · H1 2026

Their H1 2026 filing puts the average 5 days past the shortest term they state (30 days), still within their 60-day upper term.

Around averagevs a 31-day median across 6,104 recent filers

Their stated terms: 30–60 days
Paid outside agreed terms: 28% of invoices
Paid after 61+ days: 7%
Reporting period: 1 Jan 2026 – 30 Jun 2026
Source: their gov.uk filing, filed 21 Jul 2026

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

Terms vs reality · their H1 2026 filing

Paid within their stated range — 35 against 30–60 days

PAIDLATE · terms vs the clockdays to pay · 0–65

avg 35d

0 days65 days

reported avg 35 days their filed terms 30–60 days UK median 31 days · n = 6,104 recent filers

Where their invoices landed · share of all invoices

within 30 days 69% 31–60 days 24% 61+ days 7%

Source: their statutory Payment Practices Report #113176, period 1 Jan 2026 – 30 Jun 2026, filed 21 Jul 2026 · gov.uk payment-practices service

SP Transmission PLC pays within its stated range, 5 days past the shortest term. 28% of invoices still went outside agreed terms; 7% reached 61 days or more. Self-reported in their statutory H1 2026 filing.

The pattern · last 6 of 17 reports

31 → 35 days — slowing down

PAIDLATE · the patternavg days per report

Last 6 of 17 filed reports · linear day scale · every period is in the table below · Source: gov.uk payment-practices service

4 days slower across the window. From 31 days in H2 2023 to 35 in the H1 2026 filing; the dashed line marks the 30-day term they state.

The read · computed from their figures

SP Transmission PLC's H1 2026 filing puts their average at 35 days against stated terms of 30–60 days; 28% of invoices were paid outside agreed terms and 7% took 61 days or longer. Filed 21 Jul 2026.

The direction is slower: from 31 days in H2 2023 to 35 now — 4 days slower across their last 6 reports.

On the latest reported averages: Slower than 75% of the 158 large companies reporting in electricity & gas.

That is 17 statutory periods on record (earliest H1 2018) — a historical record, not a promise for a new invoice.

What they tell their suppliers

Offers e-invoicing

In their own words · from the filing

Standard payment terms

30 days from invoice date

Dispute resolution

At ScottishPower we try to resolve any invoice disputes or queries as quickly as possible. Queries regarding the status of an invoice can be directed to the Accounts Payable Team via the following email address; [email protected]. Additionally we also offer a web portal service that allows suppliers the ability to register and then login and view the status of their invoices and when they will be paid. To register for the web portal please use the following website; https://www.iberdrola.com/suppliers/supplier-portal For specific contractual disputes please contact the individual who initially ordered the goods or services provided. The agreed contractual dispute process will then be followed.

Every statutory report on record

Most recent first.

Period	Avg days	Outside terms	61+ days	Filed
H1 2026	35	28%	7%	21 Jul 2026
H2 2025	34	25%	6%	30 Jan 2026
H1 2025	36	35%	8%	24 Jul 2025
H2 2024	33	25%	6%	28 Jan 2025
H1 2024	32	20%	4%	25 Jul 2024
H2 2023	31	26%	5%	25 Jan 2024
H1 2023	35	23%	7%	27 Jul 2023
H2 2022	33	29%	7%	26 Jan 2023
H1 2022	32	27%	5%	28 Jul 2022
H2 2021	31	23%	6%	27 Jan 2022
H1 2021	38	21%	8%	26 Jul 2021
H2 2020	29	21%	4%	27 Jan 2021
H1 2020	31	23%	7%	27 Jul 2020
H2 2019	32	20%	6%	23 Jan 2020
H1 2019	39	30%	12%	26 Jul 2019
H2 2018	31	27%	8%	23 Jan 2019
H1 2018	28	61%	10%	26 Jul 2018

On the public register · Companies House

Company record

Status: Active
Type: Public Limited Company
Incorporated: 7 Sept 1998
Registered office: 320 ST. VINCENT STREET, GLASGOW, G2 5AD

0 outstanding charges on the register Accounts due 30 Jun 2027

Open the full record at Companies House.

Illustrative · working-capital arithmetic

What a 35-day cycle ties up

A worked example, not a finding. On a hypothetical £12k/month account, at a 35-day vs a 30-day payment cycle.

≈ £14,000

of invoicing outstanding at any one time on a 35-day cycle — about £2,000 more than the same account would carry at 30-day terms.

Late Payment Act. The Late Payment of Commercial Debts (Interest) Act 1998 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 · SP Transmission PLC

Are they getting slower or faster?

Their reported average has moved about 4 days slower over the window (31 → 35 days).

What's their typical pay point?

Their latest filed report puts the average at day 35; across their last 6 reports it ranged 31–36 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 SP Transmission PLC (free)

Their next payment report is due ≈ 26 Jan 2027. 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 6,104 companies with a current statutory report — every sector pooled, not an average of sector medians (how the figure is built).

Report PL-SC189126 · latest period to 30 Jun 2026

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