On a new-build development, the electricity network that connects it is increasingly owned and operated by an Independent Distribution Network Operator. IDNOs now adopt a large and growing share of new connections across the UK, building the last-mile network that a developer’s site needs and taking it on for the long term. The physical work on those sites is usually carried out by Independent Connection Providers and the developer’s own partners, which means the parts that secure and identify each substation pass through several pairs of hands before they are ever fitted.

Two of those parts are the smallest on the whole job and the easiest to lose track of: the locks that secure the asset and the labels that identify it. This piece looks at why IDNO locks and labels cause more hassle than their size suggests, what good ones look like, and why the accountability around their supply matters as much as the products themselves.

What an IDNO site needs: locks and labels

Every adopted substation, kiosk and cabinet on a development has to be secured and identified before it is energised and handed over. That comes down to two product families.

The locks keep the asset secure. Squire padlocks, a British-made brand we supply, are the standard here: robust, weatherproof and keyed to the operator’s requirements, they hold up on exposed sites for the life of the asset. Getting the right lock, keyed or mastered to the IDNO’s scheme, onto the right asset is part of a clean handover.

The labels identify it and keep people safe around it. Engraved signage, made to each client’s custom requirements, covers the danger and warning notices, substation nameplates, circuit and phase identification, and site markings that an adopted network needs. Because they are engraved rather than printed, they stay legible outdoors for decades rather than fading or peeling. Signage is produced to the IDNO’s exact specification, so what arrives on site is ready to fit, not a generic placeholder.

The accountability gap, and how to close it

Here is the problem that costs IDNOs and their partners real time. Locks and labels do not go straight from maker to asset. They travel through a chain: from supplier, to the IDNO, to the ICP or developer partner doing the site works, and finally onto the substation. Along the way, items get misplaced, the wrong delivery address gets quoted, and a set of locks or a batch of signage simply goes missing. When it does, energisation and handover wait on a small part that nobody can account for, and the finger-pointing begins: was it the supplier, the operator, or the site team.

The item that holds up an energisation is rarely the transformer. It is a missing padlock or a mislabelled kiosk, and the real cost is the hours spent working out whose fault it was.

The way to close that gap is to treat the supply of locks and labels as a tracked chain of custody, not a box left on a doorstep. We coordinate the delivery and ownership of locks and labels through to the IDNO’s developer and ICP partners, and we evidence each handover with photographs and email confirmation. That does two things. It cuts the number of items that go missing in the first place, because every stage is recorded. And when something does go astray, the record shows exactly where, so it can be resolved in minutes rather than argued over. If the mistake is ours, we hold our hands up and put it right. If it happened further down the chain, the evidence shows that too. Either way, there is ownership and accountability at every handover, which is what keeps a small part from stalling a connection.

Made in Britain, stocked and delivered nationwide

Locks and labels are only useful when they arrive on the right site at the right time, so the supply behind them matters as much as the products.

Our locks and signage are made and stored in the UK, British-made quality kept in stock rather than brought in to order, which keeps lead times short and supply dependable. We deliver nationwide, from the north of Scotland to the south of England, across to Wales and Northern Ireland, so a site anywhere on a programme can be secured and labelled without waiting. For IDNOs running connections across the country, that combination of British manufacture, held stock and national delivery is what keeps handovers on schedule.

What to look for in a locks and labels supplier: a checklist

1. Quality, weatherproof padlocks such as Squire, keyed or mastered to your network’s scheme.

2. Engraved signage produced to your exact specification: danger notices, nameplates, and circuit and phase identification.

3. Engraving rather than print, so labels stay legible outdoors for the life of the asset.

4. A tracked chain of custody through to your ICP and developer partners, not an untracked drop-off.

5. Photographic and email evidence at each handover, so losses are rare and disputes are quick to settle.

6. British manufacture and UK stock, for short lead times and dependable supply.

7. Nationwide delivery across all four nations of the UK.

Frequently asked questions

What locks and labels do IDNO sites need?

Adopted substations, kiosks and cabinets need secure, weatherproof padlocks keyed to the operator’s scheme, and engraved signage covering danger notices, nameplates, and circuit and phase identification, all produced to the IDNO’s specification before handover.

Why use Squire padlocks on utility sites?

Squire is a British-made brand built for exposed, outdoor use. Robust, weatherproof and available keyed or mastered to a network’s scheme, the padlocks hold up on substation and kiosk assets for the long term.

Why do locks and labels go missing on new connections?

Because they pass through several hands, from supplier to IDNO to the ICP or developer doing the site works, before being fitted. Untracked handovers and wrong delivery addresses are the common causes, which is why a recorded chain of custody matters.

Are your locks and labels made in the UK?

Yes. Our locks and engraved signage are British-made and held in UK stock, which keeps lead times short, and we deliver nationwide across England, Scotland, Wales and Northern Ireland.

Can signage be engraved to our own specification?

Yes. Signage is engraved to each client’s custom requirements, so nameplates, warnings and identification arrive on site ready to fit rather than as generic stock.

Related Mountrel products

• Squire padlocks, weatherproof and keyed to your network scheme

• Engraved signage and labels, made to your specification

• See the full locks and labels range

Read our related piece on why supply chain resilience is now critical infrastructure for more on dependable supply across a build.

Talk to Mountrel

Mountrel Electric supplies IDNO locks and labels for connections across the UK: British-made Squire padlocks and custom-engraved signage, held in UK stock, delivered nationwide, and coordinated through to your ICP and developer partners with photographic and email evidence at every handover. If you are supplying locks and labels across a connections programme, email the team at sales@mountrel.com and we will help you keep every site secure, correctly identified, and fully accounted for.