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Chambers of Mark Cannon QC

Living Wage
Work 020 7822 2000
Fax 020 7822 2001

Siân Mirchandani

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


Siân studied Veterinary Medicine at Cambridge University and practised before coming to the Bar in 1997.

Siân has extremely wide ranging experience of professional liability claims, including claims against lawyers, architects, engineers, insurance brokers, surveyors/valuers, accountants, financial advisers, planning consultants, land management and estate agents, and veterinary surgeons. 

During the past year Siân has acted in:

  • The successful appeal by the valuers from the decision of Mr Justice Blair, which was the first trial of a Commercial Mortgage Backed Securities or ‘CMBS’ claim against valuers brought by the issuer SPV of securitised loan notes secured against the properties valued.
  • The next case of this type to come to trial concerns allegedly negligent valuations of properties in a portfolio of London office buildings valued at considerably over £1bn (White Tower).
  • Advice and re-drafted guidance for the Law Society concerning certification of new-build property by architects following Hunt v Optima.
  • The Right to Buy ‘case managed’ litigation concerning thousands of firms of solicitor, ultimately resulting in discontinuance by the Claimants at the start of trial.
  • A multi-party dispute construction dispute arising out of Birmingham’s Broadway Plaza, defending the project architect, DLG. There have been two significant reported decisions on costs, with trial in May 2016.
  • The defence of numerous claims brought by the joint liquidator of a group of linked bridge funding entities (Tiuta companies and the Connaught Income Fund Series) against a number of different valuers and solicitors, involving different instructing solicitors. As counsel instructed on a range of such claims by different parties Siân has played a key role in orchestrating a consistent and co-operative approach to these claims.


Called 1997, Inner Temple.


Working knowledge of French.


Siân is a member of the Professional Negligence Bar Association,the Society of Construction Law, COMBAR, TECBAR, the Chancery Bar Association and the London Common Law & Commercial Bar Association. She is a Committee Member of the Technology and Construction Court Bar Association (TECBAR).


Olchfa Comprehensive School; Emmanuel College, Cambridge (1992 MA VetMB, MRCVS, Cert VA); City University, London (1996 Dip Law).


Riding, running, swimming, gym.

London Bar


Within: Construction – 2019 silks

Sian Mirchandani QC - 4 New SquareAn excellent advocate – tenacious and extremely detailed, identifying potential problems and arguments even before they arise.

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Professional discipline and regulatory law

Within: Professional discipline and regulatory law – 2019 silks

Siân Mirchandani QC - 4 New SquareWell organised, with a good understanding of clinical issues in cases.

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Professional negligence

Within: Professional negligence – 2019 silks

Siân Mirchandani QC - 4 New SquareShe is tremendously bright, has a tenacious eye for detail, and brings a new level of strategic thinking to the table.

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