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Company · London

Diploma PLC

Activities of head offices

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Official record Companies House · updated 27th September 2026 · Sources

Network

The large node is Diploma PLC. Red nodes are organisations, white nodes are people. Sign in free to explore further.

Who leads it

Previous officers 19

  1. Christopher Mark Davies 2022-2025 Director View profile
  2. Richard John Ingram 2018-2018 Director View profile
  3. Anne Thorburn 2015-2024 Director View profile
  4. Andrew Patrick Smith 2015-2024 Director View profile
  5. Charles Max Packshaw 2013-2021 Director View profile
  6. John Edward Nicholas 2013-2022 Director View profile
  7. Marie-Louise Louise Clayton 2012-2015 Director View profile
  8. Ian Michael Grice 2007-2013 Director View profile
  9. John Waylett Matthews 2003-2013 Director View profile
  10. John Leonard Rennocks 2002-2015 Director View profile
  11. John Iain Henderson 2000-2016 Director View profile
  12. William Reid 2000-2003 Director View profile
  13. Aubrey John Christopher Thomas 2000-2004 Director View profile
  14. Lord Bernard Harold Ian Halley Stewartby 2000-2007 Director View profile
  15. Bruce Mckenzie Thompson 2000-2018 Director View profile
  16. John Morrison 2020-2025 Secretary View profile
  17. Anthony James Gallagher 2012-2020 Secretary View profile
  18. Nigel Peter Lingwood 2001-2020 Secretary View profile
  19. Andrew Michael Reay Parkinson 2000-2001 Secretary View profile

Directors and secretaries as filed at Companies House.

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About

What it does
Activities of head offices
Incorporated
24/12/1999
Registered office
London

Group

No further corporate or individual controller is recorded above Diploma PLC on the PSC register - it appears to be the top of its group.

36 other companies in this group

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.

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.

11 directors on the board

3.1y median 2.5y
average tenure
7.4y
longest tenure

Directors past 6 years

First-time vs portfolio directors

First-time (2)

Portfolio (9)

1
left in the last 12 months

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.

Professional services 11Finance 5Construction 4Arts and leisure 1Dormant 1Property 1Tech and media 1Utilities 1

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
03899848
Status
Active
Type
Public Limited Company
Accounts next due
31/03/2027
Edition
Register edition compiled 27th September 2026
Labels
Official record from Companies House · Calculated derived by Governance Register.

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