Official UK procurement notice
CM141 - Bathymetry & Topographic Surveys - Smalls, Eddystone and Les Hanois Lighthouses
Authority: Trinity House
What is being bought
Published requirement descriptionTrinity House (TH) holds the operation and maintenance responsibility for over 60 lighthouses around England, Wales, the Channel Islands and Gibraltar. These critical aids-to-navigation (AtoNs) include several Rock Tower lighthouses that require regular modernisation and ongoing maintenance.
Accordingly, Trinity House would like to investigate the feasibility of utilising jack-up and floating assets to avoid repeated journeys to these remote locations by helicopter to mobilise personnel, equipment and tools.
To support this investigation, it is important to have accurate bathymetric and topographic surveys of the surrounding area.
In order to ensure successful completion of all survey by the end of March 2027, Trinity House reserve the right to appoint a singular or multiple suppliers to fulfil this requirement.
As a result, suppliers are requested to submit individual costs for each location.
CPV: Topographical services
The lotProcurement structure
single lot · value publishedLot #1Published value£90,000
What it takes to wini
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
Evaluation split and conditions of participation as published; the tender pack may add morei
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
- Criterion 1
No conditions of participation were published on the notice; check the tender documents.
- Turnover usually expected at this size: about £180,000 (twice the annual value).
Turnover is an indicative market norm (≈2× annual value), not a published condition.
Competition analysis · published record, not a forecast of who will bid
How Trinity House buys Engineering-related scientific and technical services (CPV 7135), and who usually turns up
Trinity House’s published record next to the market for the same work. Frameworks and DPS are left out: they draw different bid counts. Whole-market view: Engineering-related scientific and technical services (CPV 7135) →
How the contest usually goes
Winner shares use published awards; bid and price charts use contested lots.
i
How often small and medium firms win.
Share of awards where the winner’s size is known.
The counts under this question show how many awards have a known supplier size.
Small firms have won here. Neither number says whether you qualify; it describes who has been winning.
i
How often local firms win similar work.
Winners with a registered address in the delivery region, out of awards with a known address.
Local means the winner is registered in the region where that award was delivered. The market figure counts awards delivered in Greater London (authority’s region).
A local branch does not count if the registered address is elsewhere.
Most of this buyer’s recorded winners were registered outside the region where that award was delivered.
i
How long buyers here take to decide after bids close.
Middle value in days from the bid deadline to the award date, on competitions that published both.
Only decided tenders count, so slow ones still waiting are not in.
Half of these awards have an award date within 20 days of the bid deadline.
i
How often work is awarded with no recorded rival.
Direct awards and tenders where every published lot count shows one bid.
Both shares are minimums: some awards have no bid count.
Thin markets produce this too; it is not proof of a tailored specification.
Direct awards or one recorded bid are common here. Check the route before spending time on a bid.
How many bids did past lots attract?
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How many bids past lots received.
Each colour is a bid-count range. Only competed lots with a published count are included.
Past bids do not predict this tender.
1 bid4% / 0%
2–348% / 25%
4–636% / 75%
7+12% / 0%
How did awards compare with estimates?
i
Where winning prices landed against estimates.
Each colour shows awards below, close to or above the published estimate, one lot at a time.
Past prices are a guide, not a bid price.
Below estimate57% / 46%
Within ±2%29% / 29%
Above estimate14% / 25%
Assess each lot i
What past awards tell you about each lot.
See the forecast, this buyer’s earlier suppliers and firms with relevant wins.
No supplier is confirmed as a bidder.
i
What past awards tell you about each lot.
See the forecast, this buyer’s earlier suppliers and firms with relevant wins.
No supplier is confirmed as a bidder.
Open a lot for its forecast, this buyer’s previous supplier and possible competitors, from published award history, not a bid list
Lot #1CPV 7135Published estimate£90k
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How many bids this lot may attract.
The forecast uses similar past competitions. The bar shows either that forecast or past bid counts; the line below says which.
Each lot shows its own forecast based on its own category; forecasts for different lots of the same notice are not comparative.
A forecast, not a list of bidders.
1 bid10%
2–346%
4–636%
7+8%
i
Where the award price may land.
The forecast uses similar awards and the buyer’s estimate. The band covers the middle half of likely prices.
Based on 27 comparable awards. Each lot reflects its own category; forecasts for different lots of the same notice are not comparative.
A statistical guide from past awards, not a price to bid.
Middle 50%£72k–£89k
Estimate£90k
Who has supplied this buyer on similar work? i
Who has done similar work for this buyer.
Past contracts are matched by buyer, title and type of work.
A past supplier may not bid again.
i
Who has done similar work for this buyer.
Past contracts are matched by buyer, title and type of work.
A past supplier may not bid again.
| Supplier | This buyer’s earlier contract | Lot | Award value | Why listed |
|---|---|---|---|---|
| Castle Surveys LimitedLive contract | CM4 - Bathymetry & Topographic Surveys Bishop Rock and Longships Lighthousesruns to Nov 2026 | — | £47k | Matched as the earlier contract |
| Castle Surveys LimitedWorked for this buyer | STA1529 Bathymetric and Topographic Survey of Wolf Rock Lighthousenotice published Jun 2026 | — | — | Similar wording and category |
Who could compete for this lot? i
Who could compete for this lot?
Firms with relevant past wins. On a framework, we show firms on that agreement.
None is confirmed as a bidder.
i
Who could compete for this lot?
Firms with relevant past wins. On a framework, we show firms on that agreement.
None is confirmed as a bidder.
| Supplier | Won in this category | Live contracts | Award vs estimate |
|---|---|---|---|
| £103k3 awards in 36m · last 1 months ago | 1 live · £47k iPublic contracts this supplier still holds. Its awards whose published end date is still in the future, with their values. Many contracts publish no end date, so this is a floor, not the whole book. Unexpired says nothing about spare capacity. | no comparable pairs | |
FugroLarge | — | None on file | no comparable pairs |
WSP UK LimitedLarge | £487m123 awards in 36m · last this month | 49 live · £411m iPublic contracts this supplier still holds. Its awards whose published end date is still in the future, with their values. Many contracts publish no end date, so this is a floor, not the whole book. Unexpired says nothing about spare capacity. | at estimate n=17 |
Atkins LimitedLarge | £138m83 awards in 36m · last this month | 25 live · £178m iPublic contracts this supplier still holds. Its awards whose published end date is still in the future, with their values. Many contracts publish no end date, so this is a floor, not the whole book. Unexpired says nothing about spare capacity. | at estimate n=13 |
Mott MacDonaldLarge | £72m86 awards in 36m · last this month | 15 live · £40m iPublic contracts this supplier still holds. Its awards whose published end date is still in the future, with their values. Many contracts publish no end date, so this is a floor, not the whole book. Unexpired says nothing about spare capacity. | 11% below n=19 |
About this data
- Source. Official UK public procurement notices (Find a Tender), reused under the Open Government Licence v3.0. New notices arrive through the day; the figures are rebuilt nightly.
- Two views, kept apart. The authority’s own track record and the wider market for the same kind of work sit side by side and are never mixed. Where the local picture is too thin, a figure widens to a broader market and says which one it used.
- Forecasts are labelled. The price forecast and its range, possible competitors and the earlier-work matches are our estimates from past awards: not published facts, not win chances and not price advice. Official notices do not say who is bidding.
- Every figure shows what it rests on. Not every notice publishes a bid count, a value or a delivery region, so each figure carries the number of records behind it, and one built on few records is marked as such. The on a figure explains it; the counting rules are in the methodology. Spotted something wrong? Tell us.
What this replaces i
Who has done similar work for this buyer.
Past contracts are matched by buyer, title and type of work.
49% title match.
A past supplier may not bid again.
i
Who has done similar work for this buyer.
Past contracts are matched by buyer, title and type of work.
49% title match.
A past supplier may not bid again.
The prior contract this notice most likely re-tenders · matched by title and category (49% title match), the holder is not guaranteed to re-bid
CM4 - Bathymetry & Topographic Surveys Bishop Rock and Longships Lighthouses — held by Castle Surveys Limited; the published contract ends 30 Nov 2026.
Procedure terms & legal framework
From the official record- Procedure method
- Below threshold - open competition
- Legal basis
- UKPGA · 2023/54 Procurement Act 2023
- Procurement category
- Services
- Notice status
- Open for tender
- Procurement threshold
- Below threshold
- Regulatory regime
- Standard
- Commercial structure
- Stand-alone contract (no framework)
- Competition type
- Competitive procedure
- GPA / WTO covered
- Unspecified in notice
- Recurring procurement
- Unspecified in notice
- First published
- 23 Oct 2026, 14:26 BST
- Last source update
- 23 Oct 2026, 14:26 BST
- FTS notice number
2026/S 000-100557- Latest notice
- Tender notice (UK4)
- Classification (CPV)
- Delivery area
- Not published
- Official registry OCID
ocds-h6vhtk-078f2aFind a Tender
How to participate & submission route
Official notice- Requests to participate (first stage)
- —
- Tender submission deadline
- 13 Nov 2026, 23:59 GMT
- Clarification deadline
- 6 Nov 2026, 23:59 GMT
- Electronic submission
- Not allowed
Please email [email protected] if you wish to view the full specification for this Tender.
Timeline
23 Oct 2026 → 27 Nov 2026 · 4 dates- Tender notice published1 day ago23 Oct 2026, 14:26 BST
- Today24 Oct 2026
- Clarification questions byin 13 days6 Nov 2026, 23:59 GMT
- Submission deadlinein 20 days13 Nov 2026, 23:59 GMT
- Contract startsin 33 days27 Nov 2026
Notice history
1 event · 1 release on Find a Tender- Tender notice published23 Oct 2026, 14:26 BSTUK4
Commercial outcome & contract awards
Nothing awarded yet- Awards (0)
- No award published
- Contracts (0)
- No contract published
- Bid statistics
- No aggregate bid statistics published
Contracting authority & participating public bodies
Official documents & specifications (1)
Official links; attachments are not copiedNotices published for this procedure
- Tender notice Tender notice on Find a Tender