Timothy Marcus Litton Simson

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Retired British Army brigadier; Chief Executive of the Honourable Artillery Company

Official GOV.UK portrait, first published 23 August 2019 (Crown Copyright)

Timothy Marcus Litton Simson (born August 1968), known as Marcus Simson, is a retired British Army brigadier and the Chief Executive of the Honourable Artillery Company (HAC).[1][2][3]

Military career

The official GOV.UK biography of Brigadier Marcus Simson says that he was commissioned into the Queen's Own Hussars, "an armoured main battle tank regiment", in 1989, was stationed in Germany "at the tail end of the Cold War", and served in junior regimental appointments on operations in Northern Ireland, Cyprus, Cambodia and Bosnia. After leaving regimental duty in 1996 he spent two years delivering the Army's operational training for Bosnia.[4]

The London Gazette records that he was promoted from lieutenant to captain on 11 April 1993 while serving with the Queen's Own Hussars (service number 532238).[5] On 22 November 1993 he converted from a short service commission to a regular commission in the Queen's Royal Hussars, with seniority as a second lieutenant from 11 April 1987 and as a lieutenant from 11 April 1989, and was appointed captain with seniority from 11 April 1993.[6]

According to the GOV.UK biography, he was promoted to major in 1998 and, after the Staff College, returned to Germany in 2001 to command an armoured squadron, which he deployed to Kosovo. He was then Deputy Chief of Staff of the 12 Mechanised Brigade during the brigade's conversion to digital communications, and later deployed with the brigade to southern Iraq. He subsequently served as an instructor at the Staff College.[4]

The biography says he was promoted to lieutenant colonel in 2006 and completed the first of two appointments as a career manager at the Army Personnel Centre. He commanded the 2nd Royal Tank Regiment in 2008–10, and undertook his first deployment to Afghanistan in that command. He then returned to Afghanistan as Military Assistant to the Director of Force Reintegration at Headquarters ISAF, and later held a personnel post at Army Headquarters responsible for operational personnel policy.[4][7]

The London Gazette recorded his promotion from lieutenant colonel to colonel on 30 June 2012, with seniority of the same date, listing him under the Royal Tank Regiment.[8] The GOV.UK biography dates the promotion to January 2012 and says that, on promotion, he was appointed Director Campaign Plans in Headquarters Joint Operations Command in Australia, where he worked on Australian operational and defence-engagement planning and on engagement with Headquarters PACOM and Joint Forces New Zealand. In 2014 he returned to the United Kingdom to the Army Personnel Centre to manage senior officers' careers. In 2016 he moved to the Army Personnel Services Group, with responsibility for the Army's discipline, operational legacy management, support to inquests and Service Inquiries. The biography says he was promoted to brigadier in August 2018.[4]

Defence Adviser, Australia

GOV.UK lists his previous government role as Defence Advisor, Australia, from 2019 to 2023.[4] In October 2021, writing in Defence Connect, he described himself as "currently serving as a defence adviser at the British high commission". The same article discusses the AUKUS partnership between the United Kingdom, Australia and the United States.[7] In February 2023 Defence Connect reported that the incoming British Defence and Military Adviser and head of British Defence Staff Oceania, Brigadier Nigel Best, and the outgoing Brigadier Marcus Simson, had visited Papua New Guinea, and quoted Simson, as outgoing holder of that post, on British defence cooperation with the Papua New Guinea Defence Force.[9]

The London Gazette records that "Brigadier T. M. L. SIMSON 532238 retires 1 September 2023".[10]

Companies House records that Timothy Marcus Litton Simson (born August 1968) was a director of Stockbridge Global Ltd (15431480), a management consultancy incorporated on 22 January 2024 and dissolved on 11 November 2025, from 22 January 2024.[2][11]

Honourable Artillery Company

The HAC's report and financial statements for the year ended 31 October 2025 list "T M L Simson Esq" as Chief Executive among the principal executive officers of the Company. The accounts state that "Day-to-day operation of the Company is delegated to the Chief Executive and the Company Office", and that the Chief Executive rents a Company-owned flat "at market rates".[1]

Companies House records Timothy Marcus Litton Simson as a director of two HAC subsidiaries, HAC Enterprises Limited (01677400) and Pencelli Limited (03724227), from 24 October 2024, and of 14 City Road Residential Limited (16361960) from 2 April 2025. The correspondence address on those appointments is Armoury House, City Road, London.[2]

On 4 February 2026 Veterans Aid announced that it had become the HAC's charitable partner for three years, and quoted "Marcus Simson, CE of the HAC" on the Company's support for the charity.[3]

Personal life

The GOV.UK biography says that "Marcus is married". It does not name his spouse, and no sourced names of parents or children have been located.[4]

See also

Notes

  1. ↑ 1.0 1.1 Honourable Artillery Company, Report of the Court of Assistants and Financial Statements for the year ended 31 October 2025, filed with the Charity Commission for England and Wales, accessed 12 November 2026.
  2. ↑ 2.0 2.1 2.2 Companies House, personal appointments of Timothy Marcus Litton Simson and a further appointments record under the same name, accessed 12 November 2026.
  3. ↑ 3.0 3.1 VA adopted as HAC's charitable partner Veterans Aid, 4 February 2026, accessed 12 November 2026.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Brigadier Marcus Simson GOV.UK, first published 23 August 2019, accessed 12 November 2026.
  5. ↑ The London Gazette, Issue 53286, supplement p. 7378, 27 April 1993, accessed 12 November 2026.
  6. ↑ The London Gazette, Issue 53638, supplement p. 5468, 12 April 1994, accessed 12 November 2026.
  7. ↑ 7.0 7.1 Brigadier Marcus Simson, Match fit and well-equipped Defence Connect, 8 October 2021, accessed 12 November 2026.
  8. ↑ The London Gazette, Issue 60197, supplement p. 12690, 3 July 2012, accessed 12 November 2026.
  9. ↑ UK Defence advisers deepen defence cooperation with visit to PNG Defence Connect, 14 February 2023, accessed 12 November 2026.
  10. ↑ The London Gazette, Issue 64162, supplement p. 17681, 5 September 2023, accessed 12 November 2026.
  11. ↑ Companies House, Stockbridge Global Ltd (15431480), accessed 12 November 2026.
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