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Chambers of Mark Cannon QC

Living Wage
Work 020 7822 2000
Fax 020 7822 2001

Roger Stewart QC

Work 020 7822 2000
4 New Square (Chambers of Mark Cannon QC)


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.

London Bar


Within: Construction – Leading silks

Roger Stewart QC - 4 New SquareA very impressive silk, providing good practical advice.

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IT and telecoms (excluding regulatory)

Within: IT and telecoms (excluding regulatory) – Leading silks

Roger Stewart QC - 4 New SquareHe is an excellent advocate and is able to convey very complex legal and factual issues simply.

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Insurance and reinsurance

Within: Insurance and reinsurance - Leading silks

Roger Stewart QC - 4 New SquareExtensive experience of coverage and indemnity work.

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International arbitration: counsel

Within: International arbitration: counsel – Leading silks

Roger Stewart QC - 4 New SquareVery thorough and a brave and fearless advocate.

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Professional negligence

Within: Professional negligence – Leading silks

Roger Stewart QC - 4 New SquareHe is very knowledgeable, very focused, robust where necessary and totally committed.

Within: Professional negligence

4 New Square is ‘regarded as one of the go-to sets for professional negligence work’ and it stands out for its ‘great strength in depth’ and for a ‘focus on quality.’ Members act for both claimants and defendants on an array of disputes; Roger Stewart QC and Scott Allen were successful in the leading Supreme Court case examining solicitors’ negligence, BPE Solicitors v Hughes-Holland, in which David Halpern QC also appeared. David Turner QC and Nicole Sandells QC were also victorious in the Supreme Court case Swynson v Lowick Rose LLP, which was a claim involving accountants’ negligence. In the Court of Appeal, Neil Hext QC acted for the successful respondent insurance broker in Channon v Ward.

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United Arab Emirates: The English bar


Within: Leading silks

Roger Stewart QC - 4 New SquareHe has exceptional judgement in complex cases and the innate ability to seize on the point that matters.

Within: Construction

4 New Square’s Roger Stewart QC handles disputes over the construction of large infrastructure projects.

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