Roger Stewart KC > 4 New Square Chambers > London, England > Lawyer Profile

4 New Square Chambers
4 New Square

Living Wage


Has a broad commercial practice with particular specialisation in international arbitration, insurance and construction as well as professional liability; recently acted in very substantial disputes for and against sovereign states as well as in private law claims. Recent cases include: Costain Ltd & Ors v Bechtel Ltd & Anor [2005] EWHC 1018 (TCC); Beary v Pall Mall Investments [2005] EWCA Civ 415; Multiplex Construction (UK)Ltd v Cleveland Bridge UK Ltd & Anor [2007] EWCA Civ 1372; Kamar v Nightgale & Anor [2007] EWHC 2982(QB); HLB Kidsons v Lloyds Underwriters & Ors [2007] EWHC 2699; Nationwide Building Society v Dunlop Haywards Ltd & Anor [2007] EWHC 1374 (Comm); Cherney v Deripaska [2007] EWHC 965 (Comm); Mirant Asia-Pacific Construction (Hong Kong) Ltd v Ove Arup & Partners International Ltd & Anor [2007] EWHC 918(TCC); Baxendale-Walker v The Law Society [2007] EWCA Civ 233; Fulham Leisure Holdings Ltd v Nicholson Graham Jones [2008] EWCA Civ 84; Cheshire Building Society v Dunlop Haywards (DHL) Ltd & Ors [2008] EWHC 51 (Comm), Mehjoo v Harben Barker, [2014] EWCA Civ 358, Gabriel v Little, [2013] EWCA Civ 1513, Clydesdale Bank v Workman [2013] EWHC 110, Amec v MOD [2013] EWHC 110, Capita v Drivers Jonas [2012] EWCA Civ 1417, Shepherd v Pinsent Masons [2012] EWHC 43, Trigger Litigation [2012] UKSC 14, Hawksford v Stella [2012] EWCA Civ 55, Harrison v Shepherd Homes [2011] EWHC 1811; City & General v Royal & Sun Alliance [2010] EWCA Civ 911.


Qualified 1986; Inner Temple; Bencher 2002; Junior Bench Auditor; publications: general editor of 5 to 7th editions in succession to Sir Rupert Jackson of ‘Jackson and Powell on Professional Negligence’; Silk 2001; Bencher 2002.




Oundle School; Jesus College, Cambridge (1985 LLM, 1986 MA).


National Liberal Club, Lost Valley Mountaineering Association, Serpentine Swimming Club.

Lawyer Rankings

Middle East: The English Bar > Construction

(Leading silks)Ranked: Tier 1

Roger Stewart QC4 New Square ‘Roger is an acknowledged star of the bar. He masters the papers and so is able to cross examine powerfully.’

4 New Square‘s Roger Stewart QC has a broad construction, engineering, infrastructure, energy and PFI disputes practice, with substantial experience representing contractors, subcontractors and consultants on cross-border disputes. Timothy Chelmick is another key individual to note in this space.

London Bar > Construction

(Leading Silks)Ranked: Tier 1

Roger Stewart KC4 New Square ‘Roger is phenomenal. He is able to get to grips with complicated legal, factual and technical matters quickly, and can distil them in an easily digestible form. He has excellent instincts and is at the top of his game.’

4 New Square provides representation on a range of construction-related matters, and coupled with its professional negligence expertise, it offers particular strength in defending claims for contractors. Four members of chambers have been instructed on different aspects of UBB Waste v Essex County Council, a high-value dispute over a 25-year PFI contract for the construction and operation of a waste treatment, including Roger Stewart KC, Richard Liddell KC, George McDonald and Lucy Colter. Thomas Ogden is acting on Frames Process Systems v Vulcanic UK, a multi-million euro claim relating to defective equipment on offshore vessels. Members of chambers are also instructed on a number of delay and disruption construction claims, as well as claims involving issues of insurance. Internationally, it is involved in a range of construction arbitration matters, with Cyril Chern acting on a number of arbitrations relating to major engineering and construction projects.

London Bar > Insurance and reinsurance

(Leading Silks)Ranked: Tier 4

Roger Stewart KC4 New Square

London Bar > IT and telecoms (infrastructure and contracts)

(Leading Silks)Ranked: Tier 3

Roger Stewart KC4 New Square

London Bar > Professional disciplinary and regulatory law

(Leading Silks)Ranked: Tier 3

Roger Stewart KC4 New SquareRoger is a truly exceptional advocate and is devastating in cross examination, which makes him the first port of call when there is serious trouble which you need to fight your way out of.

London Bar > Professional negligence

(Leading Silks)Ranked: Tier 1

Roger Stewart KC4 New Square

London Bar > International arbitration: counsel

(Leading Silks)Ranked: Tier 2

Roger Stewart KC4 New Square ‘Roger is my go to silk for large scale international construction arbitrations and when I know there there is going to be a fight. Top of his game.’

4 New Square ‘has really good strength in depth, both across their range of silks and their juniorsThe set’s members have experience of investment treaty disputes, commercial arbitrations and enforcement proceedings and challenges. A notable example of the latter was Province of Balochistan v TCC in which George Spalton KC acted for the claimant in challenging a £5bn award for lack of jurisdiction following ICSID and ICC arbitrations. Roger Stewart KC has a strong reputation and led Timothy Chelmick  and three more junior members in a major UK-based IT arbitration claim. Matthieu Gregoire  is a big name on the investment treaty side and is representing Sri Lanka in KLS Energy Lanka v Sri Lanka, a US$100m dispute arising from the cancellation of a wind and solar hybrid power plant project.