Critical Maritime Systems & Support Limited

Active00953609 Private limited company

Incorporated: 6 May 1969 (57 years)
Previously known as: TPG Maritime Limited (until 17 July 2023)
Atmosphere Control International Limited (until 27 May 2016)
Wellman Defence Limited (until 3 May 2012)
Earlier: Wellman CJB Limited, CJB Developments Limited
Industry: Manufacture of other special-purpose machinery n.e.c. (28990)
Directors: Jonathan Brett
Sarah Elizabeth Cole
Crispin James Keanie
Owned by: Science Group PLC
Accounts type: Full
Region: East of England
Address: Harston Mill Royston Road
Harston
Cambridge
CB22 7GG

Filing status

Accounts due: 30 September 2027
Last accounts: 31 December 2025
Conf. stmt due: 15 May 2027
Last conf. stmt: 1 May 2026

Charges

Total: 15
Outstanding: 3
Part satisfied: 0
Satisfied: 12

Officers 3 active

Officer details are public data from the Companies House register.

Brett, Jonathan

Director · Appointed 27 January 2023

Also at Oakland Innovation Ltd, Technology Sciences Group Consulting Limited, Leatherhead Research Limited · more companies

British

Born August 1979 (47)

Cole, Sarah Elizabeth

Director · Appointed 27 January 2023

Also at Oakland Innovation Ltd, TPG Services Limited, Technology Sciences Group Consulting Limited · more companies

British

Born July 1979 (47)

Keanie, Crispin James

Director · Appointed 27 January 2023

Also at Dentaid Limited, Brookside Rural Park Foundation Limited

British

Born June 1982 (44)

Officer history (36 former)

31 May 2023

Resigned Stroud, Derren Mark as Director

27 January 2023

Appointed Cole, Sarah Elizabeth as Director

27 January 2023

Appointed Keanie, Crispin James as Director

27 January 2023

Appointed Brett, Jonathan as Director

30 June 2022

Resigned Barr, Daniel James as Director

1 May 2022

Resigned Macpherson, Claire Louise as Secretary

24 February 2022

Resigned Constable, Jon Neil as Director

22 October 2021

Appointed Constable, Jon Neil as Director

22 October 2021

Appointed Barr, Daniel James as Director

10 October 2021

Resigned Macpherson, Claire Louise as Director

15 February 2018

Appointed Macpherson, Claire Louise as Director

9 February 2018

Resigned Kings, Simon John Nicholson as Director

21 June 2016

Appointed Kings, Simon John Nicholson as Director

21 June 2016

Appointed Kings, Simon John Nicholson as Director

21 June 2016

Resigned Cartmell, Philip as Director

21 June 2016

Resigned Kings, Simon John Nicholson as Director

1 March 2016

Appointed Stroud, Derren Mark as Director

1 February 2016

Appointed Cartmell, Philip as Director

1 February 2016

Resigned Crawford, Mark Stephen as Director

1 February 2015

Resigned Webb, Michael John as Secretary

1 February 2015

Appointed Macpherson, Claire Louise as Secretary

1 September 2014

Resigned Carter, Jonathan Philip as Director

31 July 2014

Resigned Cassidy, Stephen as Director

22 July 2013

Appointed Carter, Jonathan Philip as Director

31 March 2013

Resigned Lawrence, Peter Charles as Director

28 February 2013

Appointed Webb, Michael John as Secretary

31 December 2012

Resigned Harrow, Stephen Giles as Secretary

5 April 2012

Appointed Crawford, Mark Stephen as Director

5 April 2012

Resigned Shannon, George as Secretary

5 April 2012

Resigned Shannon, George as Director

5 April 2012

Appointed Harrow, Stephen Giles as Secretary

28 August 2007

Resigned Rolfe, Bernard Philip as Director

28 October 2006

Resigned Watkins, James, Dr as Director

12 October 2006

Resigned Goodrow, Paul as Director

14 December 2005

Appointed Watkins, James, Dr as Director

14 December 2005

Appointed Rolfe, Bernard Philip as Director

14 December 2005

Appointed Goodrow, Paul as Director

2 August 2005

Resigned Baxter, Alan John as Director

4 August 2003

Appointed Shannon, George as Secretary

4 August 2003

Resigned Chitty, Jonathan Lees as Director

4 August 2003

Resigned Chitty, Jonathan Lees as Secretary

4 August 2003

Appointed Shannon, George as Director

31 May 2002

Appointed Chitty, Jonathan Lees as Secretary

31 May 2002

Resigned Smith, Jonathan Francis as Director

31 May 2002

Resigned Smith, Jonathan Francis as Secretary

31 May 2002

Appointed Chitty, Jonathan Lees as Director

2 April 2001

Appointed Cassidy, Stephen as Director

2 January 2001

Resigned Couzens, Raymond George as Director

31 October 1999

Resigned Duckworth, Simon Charles as Secretary

29 October 1999

Appointed Smith, Jonathan Francis as Secretary

30 April 1999

Resigned Smith, Terence as Director

21 May 1998

Resigned Hancox, Roger Frederic as Director

30 June 1997

Appointed Smith, Terence as Director

1 April 1997

Appointed Couzens, Raymond George as Director

17 March 1997

Appointed Lawrence, Peter Charles as Director

28 February 1997

Appointed Duckworth, Simon Charles as Secretary

28 February 1997

Appointed Smith, Jonathan Francis as Director

28 February 1997

Appointed Baxter, Alan John as Director

28 February 1997

Appointed Hancox, Roger Frederic as Director

28 February 1997

Resigned Worlidge, Robert as Director

28 February 1997

Resigned Pim, Colin John as Secretary

28 February 1997

Resigned Couzens, Raymond George as Director

28 February 1997

Resigned Holt, Michael St John as Director

28 February 1997

Resigned Osborne, Brian Roy as Director

31 July 1995

Resigned Leppard, Colin John as Director

1 September 1993

Appointed Worlidge, Robert as Director

31 October 1992

Resigned Smith, Charles Patrick as Director

28 May 1992

Resigned Baxandall, Charles Arthur Hillman as Director

Ownership 1 active

People and entities with significant control, from the Companies House PSC register

Science Group PLC

Corporate entity · Notified 11 September 2025

Owns 75–100% of shares

Holds 75–100% of voting rights

Right to appoint and remove directors

Public Limited Company

Reg. no. 06536543

Former controllers (1)

11 September 2025

Ceased TP Group Limited — Owns 75–100% of shares

Group structure 9 companies

Ownership group derived from the Companies House PSC register

Science Group PLC

Critical Maritime Systems & Support Limited This company Owns 75–100% of shares

Leatherhead Research Limited Owns 75–100% of shares

Oakland Innovation Ltd Owns 75–100% of shares

Osprey Consulting Services Limited Owns 75–100% of shares

Quadro Epsom Limited Owns 75–100% of shares

Quadro Harston Limited Owns 75–100% of shares

Sagentia Limited Owns 75–100% of shares

TPG Services Limited Owns 75–100% of shares

Filings

Recent filings only. See the full history on Companies House

Date	Description	Made Up To
17 August 2026	Full accounts	31 December 2025
5 May 2026	Confirmation statement with updates	1 May 2026
1 October 2025	Cessation of a person with significant control
1 October 2025	Notification of a person with significant control
27 May 2025	Full accounts	31 December 2024