Whito directory · Operators and concessionaires
Infrastructure operators in the UK
5 firms listed, 23 September 2026. Each checked at Companies House, each with its named work or licence and the source.
What counts as operators and concessionaires
An operator or concessionaire owns or runs one asset, or a small set, once it is built: a tunnel, a railway, a port. It is paid to run the asset, often under a licence or a long contract.
A firm goes in the group that matches the work it has actually done, from a public source. See who builds what for the four groups.
The listings
Listed A to Z. None has been claimed yet, so none is marked Verified. Nobody can pay to appear or to move.
| Firm | Legal name | Company number | Named work |
|---|---|---|---|
| Associated British Ports | ASSOCIATED BRITISH PORTS | ZC000195 | Immingham Eastern Ro-Ro Terminal. |
| Connect Plus | CONNECT PLUS (M25) LIMITED | 06683845 | Buyer of an M25 improvement works framework. Its Find a Tender notice describes its 30-year DBFO contract with National Highways. |
| Forth Ports | FORTH PORTS LIMITED | SC134741 | Charles Hammond Berth at the Port of Leith, formally opened as an offshore renewable energy berth. The release describes more than £100 million of private investment in Leith as a renewables hub. |
| HS1 | HS1 LIMITED | 03539665 | ORR’s periodic review for HS1 Ltd (PR24), which “covers funding for the period from 1 April 2025 to 31 March 2030”. ORR published its final determination on 6 January 2025. |
| Tideway | BAZALGETTE TUNNEL LIMITED | 09553573 | Thames Tideway Tunnel. “After ten years of construction the last of 21 connections has been made … bringing the entire system online.” Thames Water is to operate it as part of its wastewater network once testing ends. |
How to check a firm in this group
Operators often trade under a name that is not the company name. Tideway is Bazalgette Tunnel Limited. We show the trading name and the legal name side by side on every profile, and the legal name is the one on contracts and accounts.
Check the licence or regulator where there is one. HS1 Ltd, for example, has its funding set by the Office of Rail and Road.
Method. Each firm was checked at Companies House on 23 September 2026: legal name, number, status, incorporation date and registered office. The named work links to an official page, a regulator’s record or the firm’s own page.
Limits. A Whito listing is not a recommendation, rating or prequalification. It is not a list of every firm in this group, only the ones we have checked so far.
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