Siân Mirchandani


M.A. Vet M.B. (Cantab.) Dip. Law (City)

Tel: +44 20 7822 2036
Email Clerk:

Year of Call: 1997


Professional Negligence Junior of the Year 

Winner of Chambers & Partners Professional Negligence Junior of the Year 2015.

Siân Mirchandani "has a sharp mind and excellent attention to detail." "She is excellent - very pleasant to deal with and extremely robust and effective for her clients." (Chambers & Partners 2016)

Since joining in 1998 following pupillage in Chambers and an earlier career as a veterinary surgeon, Siân has established a thriving practice in professional liability claims, insurance and construction/engineering. Siân has a particular interest in disputes involving technical and scientific elements and this has led to a strong construction / engineering practice and wide ranging experience in regulatory and experimental product testing claims.

"She can cut through the complex very quickly" (Legal 500 2016); ’‘Very bright, robust, dedicated and thorough’' (Legal 500 2015).

"Siân Mirchandani provides sensible, commercial and practical advice"; '"Her strong understanding of the key issues in a case ensure that solicitors feel confident that 'every angle is covered; “Dedicated and articulate, with excellent attention to detail.” (Legal 500 2014)

Impressed solicitors say that “rising star for construction and solicitors claims” Siân is “one to watch", and that Siân is “a joy to work with - very bright”.

Siân Mirchandani “regularly acts in complex professional negligence disputes. She demonstrates notable expertise in financial claims and cases with an international element”; "The great thing about her is that on every occasion her advice is strong, firm and consistent, which allows us to get an excellent settlement." "She's very strong on complex matters." (Chambers & Partners 2015)

Siân has wide and considerable experience of professional liability claims, including claims against lawyers (solicitors and barristers), architects, engineers, insurance brokers and agents, surveyors and valuers, accountants, financial services professionals, land management agents, farm management agents, estate agents, clinicians and veterinary surgeons. Siân is a TECBAR accredited adjudicator.

She also has considerable experience of professional disciplinary matters (particularly architects), arbitrations, adjudications and mediations. Having qualified from Cambridge University as a veterinary surgeon in 1992, Siân worked in academic and general practice as a veterinary surgeon before coming to the Bar and joining Chambers in 1998.

Siân has been editor and co-author of the chapter on claims against health professionals in the 5th and 6th Editions of Jackson & Powell on Professional Negligence.

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).


Professional Liability

‘Very bright, robust, dedicated and thorough’ - Legal 500, 2015 (Leading Junior: Professional Negligence)

Siân has considerable experience of claims involving professionals of all types. The Directories speak of Siân as a “rising star for construction and solicitors claims”; “one to watch”, and her profile is described as continuing “to skyrocket”.

With a professional and scientific background, Siân relishes cases which involve scientific aspects or technical issues, and this has led to a strong practice in the Technology & Construction Court. Her practical, ‘hands on’ approach has led to instructions from civil engineering and other building contractors and sub-contractors, and this ‘pure construction’ work complements her continuing construction professionals’ practice.

Siân has particularly developed a practice involving claims arising from design and construction of farm or agricultural buildings, where the combination of her veterinary background and her experience in construction claims as well as professional liability claims has given her clients a considerable advantage.

In recent years Siân has been involved in defending high value claims against major firms of valuers in cases involving commercial properties packaged as ‘tax efficient’ investments in Denmark and the UK. These cases involved valuations using yields and estimates of rental income for hotels (K/S Lincoln et al v CBRE Richard Ellis) and factory outlet centres (Capita Alternative Fund Services & Matrix Securities v Drivers Jonas), where value was added due to the tax savings to be obtained.

Apart from the main fields of professional liability, Siân has also been involved with claims concerning agricultural land agents' negligence and estate agent’s negligence.

Siân particularly enjoys cases in all areas of her practice which involve working alongside solicitors, and other professionals, as part of an interchangeable team, dealing with vast amounts of documentation, or claims involving large numbers of sub-claims.

Siân has experience of using electronic databases and e-documents, rather than conventional paper documents, and has been involved in an e-disclosure exercise in a major construction claim arising from a housing estate.

Accountants, Auditors & Actuaries

Sian has acted for and against accountants including:

Sian was also involved in major litigation arising from tax deferral and avoidance schemes involving film finance (Chase Manhattan Bank v HIH Insurance). The various pieces of this litigation, which centred on particular ‘film slates’ came to involve teams from many of London’s largest firms of solicitors, and included an enormous disclosure exercise.  

Construction Professionals

Sian has a particular interest in claims involving technical and scientific knowledge and this has led to a strong construction and engineering practice. Sian regularly appears in the TCC. Sian has also acted for and against construction professionals in a wide range of construction disputes including arbitrations and adjudications.

Examples of Sian’s work in this area include:

Financial Services Professionals

Sian has experience of claims against independent financial advisers, including:

Sian’s recent experience includes acting on a claim concerning alleged misadvice on a tax avoidance scheme involving film finance.

Insurance Brokers & Agents

Sian has acted for a number of the prominent insurance broking practices. She has also represented clients against their former insurance brokers in claims concerning selling unsuitable products, failing to advise of necessary products, failure by broker and/or client to give material disclosure to insurer; claims concerning a chain of brokers: introducing, producing, placing brokers, and their respective liabilities to insured and insurer. Sian is often instructed in multi-party disputes where both insurers and brokers are defendants.

Examples of Sian’s work in this area includes:

Sian’s recent experience includes:


Siân has acted in a very wide variety of lawyers’ negligence claims, including lost litigation and other ‘loss of a chance’ and ‘package of rights’ claims (acting for and against both solicitors and barristers).

Siân acted on behalf of the Solicitors Indemnity Fund and the defendant solicitors in the "Immunity Appeals" in Arthur J.S. Hall v. Simons [2002] 1 AC 615) which considered the question of when an attack on a previous court’s decision was an impermissible ‘collateral attack’ and led to the abrogation of barristers' immunity from suit, a victory for the solicitors, who could then seek contribution from the barristers they had instructed.

Siân acted on behalf of the defendant solicitor at all levels up to the recent Supreme Court’s decision of AIB Group (UK) Limited v Mark Redler & Co Solicitors [2014] UKSC 58 – which confirmed that causation of loss must still be proved in a claim for equitable compensation for breach of trust, and the recoverable loss is confined to the loss actually caused by the breach of trust.

Siân acted on behalf of one of the Major Defendants (solicitors) in the 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.

Examples of her wide experience in this area include:

Sian’s recent cases in this area include:

Surveyors & Valuers

Sian is regularly instructed to act on behalf of surveyors and valuers, and has recently been defending a number of claims brought by lenders, as well as pursuing valuers when acting for lenders and solicitors in claims arising out of mortgage transactions.

Sian has a full range of experience of:

Sian has been instructed in a large number of high value claims against valuers, and is familiar with the valuation methodologies in commercial property valuation for investment purposes and lending practices involved in securitisation transactions and portfolio lending. She is a leading junior for this area of work having been instructed in the main cases which are now cited in this area including:

- K/S Lincoln; K/S Chesterfield; K/S Wellingborough v CB Richard Ellis Hotels Ltd [2010] EWHC 1156 (TCC), Coulson J, in the successful defence of claims concerning hotel valuations brought by Danish property owning vehicles.

- Capita Alternative Fund Services & Matrix Securities v Drivers Jonas [2011] EWHC 2336 (Comm), Eder J ; [2012] EWCA Civ 1417, a claim concerning valuation of a factory outlet centre in Kent.

- Titan (Europe) 2006-3 plc v Colliers  [2015] EWCA Civ 1083, the Court of Appeal overturned the decision of Blair J (reported at [2014] EWHC 3106, (Comm)), that the defendant valuer had negligently overvalued a large commercial property in Germany, for the purpose of inclusion in a portfolio of loans to be securitised by Credit Suisse. For a more detailed note on this case, written by instructed counsel, please click here.

Sian was instructed in another high value claim brought by a securitisation vehicle 'SPV' concerning the valuation of a commercial property in Germany and has recently been instructed in another high value claim concerning the valuation of a portfolio of London commercial properties valued at c. £1.5b.

Veterinary Surgeons

Experience of acting on claims against veterinary surgeons, and in defending such claims and in disciplinary matters. Particular experience of claims concerning food production animals; milk production and milk losses; equine loss or amenity value claims; loss of opportunity (prize money in racing, show jumping).


Experience of a variety of chancery matters including:

Commercial Dispute Resolution

Sian undertakes a wide range of commercial work, including general and international commercial litigation, personal and corporate insolvency, commercial contractual claims. Sian has experience of pursuing freezing injunctions and pre-action disclosure applications.

Examples of Sian’s work in this area include:

Insurance & Reinsurance

Sian has wide ranging experience of advising and acting for both insurer and insured on claims concerning policy construction and coverage issues. As part of her insurance brokers’ negligence practice Sian is often instructed in claims where the insurer is the co-defendant, following avoidance of a policy.

Sian’s experience of claims in this area includes:

Recent cases include


Siân has a significant practice in defending professionals before professional disciplinary bodies, including ARB, RIBA, ACCA, ICAEW, RICS. Sian is a former member of the Disciplinary Panel for the Council of the Inns of Court which is concerned with barristers’ conduct and service issues, and was also part of a working party advising the RCVS and drafted the RCVS' current guidance on the roles of expert witnesses.

Siân has advised on and appeared many times before ARB panels defending architects against a range of complaints including: failure to maintain professional indemnity insurance; letter of engagement or appointment issues; failure to administer the contract; contractual issues; retrospective fees; claims on householder’s building insurance and CAR policies, etc.

Her past and current cases include:

Construction & Engineering

Siân has wide experience of advising and acting for employers, contractors and sub-contractors in disputes brought in the London and regional Technology and Construction Courts, including:

Recent cases include:

Property Damage

Siân has considerable experience of commercial claims, particularly claims involving fires and destruction of commercial and residential property (and contents). Alongside her insurance and reinsurance practice, Siân is regularly instructed in insurers’ subrogated claims following fires.

Current and recent cases include: