---
title: "CM4 - Bathymetry & Topographic Surveys Bishop Rock and Longships Lighthouses"
ocid: "ocds-h6vhtk-078527"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-078527"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-078527.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-078527.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "Trinity House"
published: "2026-10-09"
---

# CM4 - Bathymetry & Topographic Surveys Bishop Rock and Longships Lighthouses

Buyer: Trinity House  
Current stage: Award  
OCID: ocds-h6vhtk-078527

[View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-078527)  
[Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-078527.json)

## Summary

Trinity House commissioned bathymetric and topographic surveys at Bishop Rock and Longships lighthouses. The work involves surveying the seabed and the land around both lighthouse sites, providing information about their terrain and depths. This is a surveying service for two specified lighthouse locations, rather than a general surveying requirement across Trinity House’s estate. The buyer is Trinity House, a central government public authority based in London. The survey locations are Bishop Rock and Longships lighthouses.

The procurement is complete and the contract has been awarded to Castle Surveys Limited. Trinity House used a below-threshold limited competition. The procurement was arranged as one lot, covering surveys at both lighthouses. The contract was signed on 9 October 2026 and runs from 10 October to 30 November 2026. Its value is £47,000 excluding VAT (£56,400 including VAT). The award is recorded as active, and the contract is active. The published procurement information does not set out an evaluation method or detailed eligibility requirements.

This award shows demand for specialist bathymetric and topographic survey work at Trinity House’s lighthouse sites. A credible competitor for a similar requirement would need the technical capability and equipment to collect both seabed-depth and land-terrain survey data in and around lighthouse locations, and to deliver usable survey results within a short, defined project period. Experience working at isolated or coastal sites would be commercially relevant to this specific type of work, although no particular accreditation or named technical standard is stated. The selected supplier is an SME, demonstrating that a business of this scale has delivered the requirement. The buyer used limited competition below the procurement threshold, so suppliers should be equipped to respond to an invited competitive process.

## Notice

Bathymetry & Topographic Surveys for two of our Lighthouses - Bishop Rock and Longships Lighthouses

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/095836-2026 |
| Notice type | UK7 - Contract Details Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Limited |
| Procurement method details | Below threshold - limited competition |
| Tender suitability | Not specified |
| Awardee scale | SME |
| All stages | Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 9 Oct 2026 |
| Submission deadline | Not specified |
| Future notice date | Not specified |
| Award date | Not specified |
| Contract period | 10 Oct 2026 - 30 Nov 2026 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £47,000 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Complete |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | Trinity House |
| Locality | LONDON |
| Postcode area | Central London |
| Postcode | EC3N 4DH |
| Country | England |
| ITL 1 | TLI London |
| ITL 2 | TLI3 Inner London - West |
| ITL 3 | TLI35 Westminster and City of London |
| Local authority | City of London |
| Electoral ward | Tower |
| Westminster constituency | Cities of London and Westminster |
| Delivery location | Not specified |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | CASTLE SURVEYS LIMITED |

## CPV Codes

### Divisions

- 71 - Architectural, construction, engineering and inspection services

### Codes

- 71351810 - Topographical services

## Release History

- 9 Oct 2026 at 16:58 - Award - UK7 - Contract Details Notice - https://www.find-tender.service.gov.uk/Notice/095836-2026

## Documents

- https://www.find-tender.service.gov.uk/Notice/095836-2026
  9th October 2026 - Contract details notice on Find a Tender

## Notice URLs

- https://www.legislation.gov.uk/ukpga/2023/54/contents

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-078527. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-078527.json.