The Consolidator That Promises Not to Consolidate

Private equity buys businesses and builds them. Done well, that means investment, better systems and a platform a founder couldn’t reach alone.

Done badly, it can mean a business losing the thing that made it worth buying in the first place. Founders know both versions of the story.

Simon Parrington knew them too. He founded Celnor Group in 2023 to prove which one was possible.

Simon Parrington - Group CEO of Celnor Group

In the time it takes most startups to find product-market fit, Celnor has grown to a £275 million-revenue group operating across 60 locations and six countries, with more than 2,300 colleagues and a client base of over 20,000 organisations.

It is backed by Inflexion Private Equity and sits at the centre of a sector, Testing, Inspection, Certification and Compliance, or TICC that many people have never heard of, and almost every property owner quietly relies on.

The promise at the heart of the model is simple, and a little unusual: Celnor acquires specialist, founder-led businesses and then, largely, leaves them alone. Not because it lacks ambition. Because it thinks identity is the asset.

The Problem Parrington Saw

Before founding Celnor, Parrington spent years watching the same tension play out across the compliance and built environment sectors.

Thousands of genuinely excellent small businesses, often run by their founders, doing highly technical work in areas shaped by regulation: fire safety, ground contamination, environmental risk, CDM advisory. Demand for their services is not discretionary. It is, as Parrington puts it, mandated.

But scaling that kind of business is hard. The regulatory knowledge sits in a small team. Winning larger contracts requires a breadth of service most specialists cannot credibly offer alone. And the prospect of selling to a larger group tends to come with an unspoken trade: growth, in exchange for your culture.

"Many hit a stage where they need a platform to take it to the next level," Parrington explains, "but there's an underlying fear of losing their identity."

Celnor's pitch to those businesses is that the trade is not necessary.

What the Model Actually Looks Like

The mechanism Celnor calls its Enablement Model works by separating two things that are often tangled: infrastructure and identity. Central functions, HR, IT, legal, finance, marketing, and strategic development are supported at Group level. Day-to-day operations, client relationships and the culture that defines each business remain with the business.

The test of whether that separation holds is not in the pitch deck. It is in the work.

Earlier this year, a consortium of three Celnor member businesses submitted a joint bid for the Imperial War Museums estates framework and have now been successfully appointed.

Riverside Environmental took the primary bidder role, supported by CHPK Group and Brownfield Solutions. Together, they covered surveying, principal designer and CDM advisory, fire strategy and ground contamination across Lot 1. None of them could have bid alone. Together, they could.

Celnor's bids and tenders team coordinated the process. The three businesses brought the technical expertise.

"Clients benefit from a single, trusted network rather than a patchwork of disconnected providers," Parrington says. "They receive the flexibility and personal service they expect from a specialist SME, alongside the resilience, governance and financial security of a larger organisation."

That framing contains something worth pausing on. Clients are being offered a version of scale they could not access before, without paying the usual price for it: standardisation.

The Question the Model Raises

Celnor has reinvested over £1 million across the Group in training, technology and R&D. It facilitates collaboration through shared events, mixed-cohort communications and a dedicated bids team. It is, by design, building relationships between businesses that might otherwise never work together.

"We drive collaboration by culture," Parrington says. "People are working together because they know each other, they trust each other and they want to work together. That's a really important difference."

It is. And it also raises a question that will follow the model as it scales: is this sustainable?

It is the structural challenge every aggregation model faces as it grows. But with over 40 companies in the Group already, and that sense of unity growing alongside it, the Group is rising to that challenge.

The IWM bid speaks for itself: three founder-led specialists, working as one, winning work none of them could have reached alone. That is the story Parrington set out to tell and it’s being heard.

Celnor Group operates across Built Environment, Safety & Compliance, Risk Management and Analytical Sciences. For more on how the Group supports its member businesses, visit celnorgroup.com.