Company · London
Diamond Transmission Partners Walney Extension Limited
Transmission of electricity
Official record Companies House · updated 27th September 2026 · Sources
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Who leads it
Previous officers 10
- Michiharu Ueki 2021-2022 View profile
- Jun Nishikawa 2020-2021 View profile
- Matthew John Pitts 2020-2025 View profile
- David Alexander John Foot 2020-2022 View profile
- Ryoji Kobayashi 2020-2020 View profile
- Yasushi Umemura 2018-2020 View profile
- Gary Thornton 2017-2026 View profile
- Hiromasa Ihara 2017-2018 View profile
- Kwansoo Lee 2017-2020 View profile
- Satoshi Shimizu 2017-2017 View profile
Directors and secretaries as filed at Companies House.
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About
- What it does
- Transmission of electricity
- Incorporated
- 18/04/2017
- Registered office
- London
Ownership
Owned by (1) iOwned byIndividuals and companies registered as having significant control over this company, from the Companies House PSC (persons with significant control) register. People whose ownership could not be confirmed to one individual are not listed as confirmed owners.
- Diamond Transmission Partners Walney Extension (Holdings) Limited
75-100% shares, 75-100% voting, appoints directors · notified 2017-04-18
Group
- Diamond Transmission Partners Walney Extension Limited
is controlled by Diamond Transmission Partners Walney Extension (Holdings) Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2017-04-18 · source: Companies House PSC register - Diamond Transmission Partners Walney Extension (Holdings) Limited
is controlled by Infrastructure Investments Ofto 1 Limited
Evidence
active 25-50% shares, 25-50% voting · notified 2020-06-01 · source: Companies House PSC register - Infrastructure Investments Ofto 1 Limited
is controlled by Infrastructure Investments PPP Ofto LLP
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2022-05-09 · source: Companies House PSC register - Infrastructure Investments PPP Ofto LLP
is controlled by Infrastructure Investments PPP Ofto Midco LLP
Evidence
active 50-75% voting (LLP), 75-100% surplus assets (LLP) · notified 2022-03-03 · source: Companies House PSC register - Infrastructure Investments PPP Ofto Midco LLP
is controlled by Infrastructure Investments PPP Ofto Holdings LLP
Evidence
active 50-75% voting (LLP), 75-100% surplus assets (LLP) · notified 2022-02-03 · source: Companies House PSC register - Infrastructure Investments PPP Ofto Holdings LLP
is controlled by Infrastructure Investments (Australia) LLP
Evidence
active 50-75% voting (LLP), 75-100% surplus assets (LLP) · notified 2022-02-02 · source: Companies House PSC register - Infrastructure Investments (Australia) LLP
is controlled by Infrastructure Investments General Partner Limited
Evidence
active 25-50% voting (LLP), 75-100% surplus assets (LLP) · notified 2016-04-06 · source: Companies House PSC register - Infrastructure Investments General Partner Limited
is controlled by Infrared (Infrastructure) Capital Partners Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2016-04-06 · source: Companies House PSC register - Infrared (Infrastructure) Capital Partners Limited
is controlled by Infrared Capital Partners (Holdco) Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2016-04-06 · source: Companies House PSC register - Infrared Capital Partners (Holdco) Limited
is controlled by Infrared Partners LLP
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2016-04-06 · source: Companies House PSC register - Infrared Partners LLP
is controlled by Werner Marc Friedrich Von Guionneau
Evidence
ceased significant influence (LLP) · notified 2016-04-06, ceased 2023-07-01 · source: Companies House PSC register
Ultimately controlled by Werner Marc Friedrich Von Guionneau.
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Ownership paths are calculated from Companies House persons-with-significant-control filings. Each step shows the filed nature of control and dates; a step marked "ceased" is historical, not current.
Financials
- Employees
- 0
- Turnover
- Not reported (small or micro-entity accounts)
- Profit/loss
- £243,000
Figures from accounts filed at Companies House (iXBRL), period ending 2025-03-31. Where turnover is absent, small and micro-entity accounts are not required to report it, so it is not shown as zero.
Board analysis
Board DNA
How this board is put together, from the Companies House officer record and Charity Commission trustee records - deterministic, no AI.iBoard compositionCounted from the dated Companies House officer record: the current directors only, past directors excluded.
5 directors on the board
- Yandie Deng Director · appointed 2025
- Elizabeth Jo Beswetherick Director · appointed 2020
- James Christopher Heath Director · appointed 2022
- Akihide Ito Director · appointed 2022
- Martin Brown Director · appointed 2026
3.2y median 4.2y
average tenure
6.3y
longest tenure
Directors past 6 years
- Elizabeth Jo Beswetherick Director · appointed 2020
First-time vs portfolio directors
Portfolio (5)
- Yandie Deng Director · appointed 2025
- Elizabeth Jo Beswetherick Director · appointed 2020
- James Christopher Heath Director · appointed 2022
- Akihide Ito Director · appointed 2022
- Martin Brown Director · appointed 2026
0
also govern a charity
Left in the last 12 months
- Gary Thornton Director · appointed 2017 · resigned 2026
Where else this board sits iWhere else this board sitsThe charitable fields these directors govern in elsewhere, by Charity Commission classification. Excludes this company and any charity it is the legal face of.
Utilities 45Professional services 7Business services 6Dormant 6Health and social care 6Finance 5Construction 3Property 2
The sectors these directors govern in elsewhere. This company, and any charity it is the legal face of, are excluded - counting them would just tell you what you are already looking at.
Sources
Official record from Companies House. Governance Register calculates the connections.
Record details
- Company number
- 10726538
- Status
- Active
- Type
- Private Limited Company
- Accounts next due
- 31/12/2026
- Edition
- Register edition compiled 27th September 2026
- Labels
- Official record from Companies House · Calculated derived by Governance Register.
Contains public sector information licensed under the Open Government Licence v3.0. Report an issue · How we handle data