Diploma PLC

Active03899848 Public limited company

Incorporated: 24 December 1999 (26 years)
Industry: Activities of head offices (70100)
Directors: Amanda Jane Gradden
Cheri Marie Phyfer
Wilson Ng
all 10 directors
Accounts type: Group
Region: Greater London
Address: 10-11 Charterhouse Square
London
EC1M 6EE

Website & contact details

Website: diplomaplc.com

Filing status

Accounts due: 31 March 2027
Last accounts: 30 September 2025
Conf. stmt due: 5 January 2027
Last conf. stmt: 22 December 2025

Officers 11 active

Officer details are public data from the Companies House register.

Gradden, Amanda Jane

Director · Appointed 1 June 2026

Also at Viceroy Court Management Company Limited · more companies

British

Born March 1968 (58)

Phyfer, Cheri Marie

Director · Appointed 2 March 2026

American

Born October 1971 (55)

Ng, Wilson

Director · Appointed 14 August 2025

Also at M Seals UK Limited, Diploma Holdings PLC, Newlandglebe Limited · more companies

Malaysian

Born September 1981 (45)

Lawrence, Anna

Secretary · Appointed 30 May 2025

El-Mokadem, Ian Ramsey Safwat

Director · Appointed 15 January 2025

Also at United Utilities Water Limited, United Utilities Group PLC, Serco Group PLC · more companies

British

Born February 1968 (58)

Bickerstaffe, Katie

Director · Appointed 1 October 2024

Also at Barratt Redrow PLC, England and Wales Cricket Board Limited · more companies

British

Born April 1967 (59)

Stipp, Janice Elaine

Director · Appointed 17 January 2024

American

Born September 1959 (67)

Ward, Jennifer Suzanne

Director · Appointed 1 June 2023

American

Born September 1973 (53)

Lowden, David Soutar

Director · Appointed 19 October 2021

Also at Capita PLC, Morgan Sindall Group PLC · more companies

British

Born August 1957 (69)

Finch, Dean Kendal

Director · Appointed 21 May 2021

Also at Persimmon Homes Limited, Charles Church Developments Limited, Persimmon Public Limited Company · more companies

British

Born July 1966 (60)

Thomson, Jonathan David

Director · Appointed 25 February 2019

Also at Diploma Overseas Limited, Diploma Holdings PLC, Corpacq Group Limited · more companies

British

Born August 1972 (54)

Officer history (26 former)

15 July 2026

Resigned Huse, Geraldine Claire as Director

1 June 2026

Appointed Gradden, Amanda Jane as Director

2 March 2026

Appointed Phyfer, Cheri Marie as Director

14 August 2025

Appointed Ng, Wilson as Director

13 August 2025

Resigned Davies, Christopher Mark as Director

30 May 2025

Appointed Lawrence, Anna as Secretary

30 May 2025

Resigned Morrison, John as Secretary

15 January 2025

Appointed El-Mokadem, Ian Ramsey Safwat as Director

1 October 2024

Appointed Bickerstaffe, Katie as Director

30 September 2024

Resigned Thorburn, Anne as Director

16 July 2024

Resigned Smith, Andrew Patrick as Director

17 January 2024

Appointed Stipp, Janice Elaine as Director

1 June 2023

Appointed Ward, Jennifer Suzanne as Director

1 November 2022

Appointed Davies, Christopher Mark as Director

30 September 2022

Resigned Gibbes, Barbara as Director

19 January 2022

Resigned Nicholas, John Edward as Director

19 October 2021

Appointed Lowden, David Soutar as Director

21 May 2021

Appointed Finch, Dean Kendal as Director

20 January 2021

Resigned Packshaw, Charles Max as Director

22 June 2020

Appointed Gibbes, Barbara as Director

22 June 2020

Resigned Lingwood, Nigel Peter as Director

5 May 2020

Appointed Morrison, John as Secretary

5 May 2020

Resigned Gallagher, Anthony James as Secretary

20 January 2020

Appointed Huse, Geraldine Claire as Director

25 February 2019

Appointed Thomson, Jonathan David as Director

28 August 2018

Resigned Ingram, Richard John as Director

8 May 2018

Resigned Thompson, Bruce Mckenzie as Director

23 April 2018

Appointed Ingram, Richard John as Director

20 January 2016

Resigned Henderson, John Iain as Director

16 November 2015

Resigned Clayton, Marie-Louise Louise as Director

7 September 2015

Appointed Thorburn, Anne as Director

10 February 2015

Appointed Smith, Andrew Patrick as Director

21 January 2015

Resigned Rennocks, John Leonard as Director

30 September 2013

Resigned Grice, Ian Michael as Director

30 September 2013

Resigned Matthews, John Waylett as Director

1 June 2013

Appointed Nicholas, John Edward as Director

1 June 2013

Appointed Packshaw, Charles Max as Director

13 November 2012

Appointed Clayton, Marie-Louise Louise as Director

21 September 2012

Resigned Lingwood, Nigel Peter as Secretary

21 September 2012

Appointed Gallagher, Anthony James as Secretary

24 January 2007

Appointed Grice, Ian Michael as Director

10 January 2007

Resigned Stewartby, Bernard Harold Ian Halley, Lord as Director

7 January 2004

Resigned Thomas, Aubrey John Christopher as Director

24 July 2003

Appointed Matthews, John Waylett as Director

1 April 2003

Resigned Reid, William as Director

2 July 2002

Appointed Rennocks, John Leonard as Director

3 July 2001

Resigned Parkinson, Andrew Michael Reay as Secretary

3 July 2001

Appointed Lingwood, Nigel Peter as Secretary

3 July 2001

Appointed Lingwood, Nigel Peter as Director

3 July 2001

Resigned Parkinson, Andrew Michael Reay as Director

21 February 2000

Appointed Stewartby, Bernard Harold Ian Halley, Lord as Director

21 February 2000

Appointed Thomas, Aubrey John Christopher as Director

21 February 2000

Appointed Henderson, John Iain as Director

21 February 2000

Appointed Reid, William as Director

24 January 2000

Appointed Parkinson, Andrew Michael Reay as Director

24 January 2000

Appointed Thompson, Bruce Mckenzie as Director

24 January 2000

Appointed Parkinson, Andrew Michael Reay as Secretary

24 January 2000

Resigned Swift Incorporations Limited as Corporate Nominee Secretary

24 January 2000

Resigned Instant Companies Limited as Corporate Nominee Director

24 January 2000

Resigned Swift Incorporations Limited as Corporate Nominee Director

24 December 1999

Appointed Swift Incorporations Limited as Corporate Nominee Secretary

24 December 1999

Appointed Instant Companies Limited as Corporate Nominee Director

24 December 1999

Appointed Swift Incorporations Limited as Corporate Nominee Director

Group structure 34 shown

Ownership group derived from the Companies House PSC register

Diploma PLC This company

Diploma Holdings PLC Owns 75–100% of shares

Diploma Asia Holdings Limited Owns 75–100% of shares

Diploma Australia Holdings Limited Owns 75–100% of shares

Diploma Canada Holdings Limited Owns 75–100% of shares

Diploma Europe Holdings Limited Owns 75–100% of shares

Diploma Latam Holdings Limited Owns 75–100% of shares

Diploma One Limited Owns 75–100% of shares

Diploma Two Limited Owns 75–100% of shares

Diploma UK Holdings Limited Owns 75–100% of shares

Alpha Laboratories Limited Owns 75–100% of shares

Cabletec Interconnect Components Systems Limited Owns 75–100% of shares

Clarendon Specialty Fasteners Limited Owns 75–100% of shares

I.S. Group (Europe) Limited Owns 75–100% of shares

Is-Rayfast Limited Owns 75–100% of shares

Krempfast Limited Owns 75–100% of shares

Spring Industrial Limited Owns 75–100% of shares

Swift Aerospace Services Limited Owns 75–100% of shares

The Lodge Group Limited Owns 75–100% of shares

WDS Components Limited Owns 75–100% of shares

M Seals UK Limited Owns 75–100% of shares

Medilink Services (NI) Limited Owns 75–100% of shares

Newlandglebe Limited Owns 75–100% of shares

R&G Fluid Power Holdings Limited Owns 75–100% of shares

R&G Fluid Power Group Limited Owns 75–100% of shares

Shoal Group Limited Owns 75–100% of shares

Cablecraft Limited Owns 75–100% of shares

FS Cables Limited Owns 75–100% of shares

FSC Global Limited Owns 75–100% of shares

Specialised Wiring Accessories Limited Owns 75–100% of shares

Techsil Group Holdings Limited Owns 75–100% of shares

Techsil Holdings Limited Owns 75–100% of shares

Williamson, Cliff Limited Owns 75–100% of shares

Diploma Overseas Limited Owns 75–100% of shares

What Diploma say about themselves

“Diploma PLC is a value-add solutions group, providing critical products and services for a wide range of uses to customers across many different markets.”

— from diplomaplc.com

Filings 200

Date	Description	Made Up To
15 July 2026	Termination of appointment of a director
18 June 2026	Appointment of a director
5 March 2026	Appointment of a director
4 February 2026	Resolutions
29 January 2026	Group of companies' accounts	30 September 2025