Our work covers all areas of family law, with particular expertise in the following areas:
Call: 2008
'Sian has been so amazingly supportive and helpful. She is on top of the case, very solution-focused, responsive and reliable.'
Chambers UK Bar 2026
Sian is an experienced barrister, with a practice covering public and private children cases. She is a highly persuasive and effective advocate. Her clients find her to be a sympathetic advocate, one who understands the importance of building a strong rapport with clients in order to make difficult circumstances feel more tolerable. She has considerable legal knowledge and courtroom skills, which she deploys to achieve the best results for her clients.
Sian was called to the Bar in 2008 and became a tenant at Harcourt Chambers in 2009 after successfully completing her pupillage there.
To instruct Siân or for more information…
Call: 020 7353 6961
Email: clerks@harcourtchambers.co.uk
Sian has extensive experience of representing all parties in public law proceedings, including those assisted by the official solicitor or intermediaries. Her practice covers the whole scope of public law, including highly complex medical cases. Sian has a thorough and pragmatic approach to case management in the early stages and is particularly effective in cross-examination and trial advocacy.
Care proceedings. application by mother to restrict disclosure of certain information to the father.
Fact-finding in public law proceedings, regarding allegations of abuse by Father. Found that he had seriously abused the mother, including coercion and sexual abuse.
A hearing to decide whether the anonymised fact-finding judgment should identify Emily Waters as the perpetrator of the children’s injuries.
Final fact-finding to establish who had inflicted serious injuries to baby twins. The pool of possible perpetrators consisted of; the parents, two paid carers and the maternity nurse.
Fact-finding in care proceedings, in which the mother was found to have fabricated or induced children’s illnesses.
Care proceedings. Judgment considering the position of medical expert who the local authority asserted had been manipulated by the mother.
Sian has represented parents and children in a wide variety of private law cases. She has considerable experience of disputes concerning applications for child arrangements orders, and more specialist areas such as removal of parental responsibility and internal and international relocation. Sian has a reputation for being able to establish a rapport with a wide range of clients, from the very vulnerable to highly successful professionals. Her flexible and adaptable approach enables her to achieve positive outcomes for clients.
Sian Cox represented the mother in complex and lengthy private law proceedings. This judgment follows on from the fact finding judgment [2022] EWFC 124, in which she also appeared and a number of serious findings of coercive and controlling behaviour were made against the father. At the final hearing, Sian was able to secure significant protective orders for the mother, including lengthy s91A, restriction of parental rights, prohibited steps, and non-molestation orders. This case also posed difficult jurisdictional and procedural issues, which arose at a late stage when the father did not return to the UK for the final hearing.
Fact-finding hearing to deal with allegations made by both parties, in the context of Children Act and Family Law Act proceedings.
Sian is qualified to accept instructions directly from members of the public under the Direct Access Scheme in appropriate circumstances.
'Sian did an amazing job distilling thousands of pages down into concise and helpful advice.'
'She is incredibly thorough and pre-empts what needs to be done.'
Chambers UK Bar 2026
'Sian is incredible, considered and has calming approach, even with the most complex cases and difficult situations which result in client’s superb care and representation. One of Sian’s key skills is to be able to explain difficult concepts and outcomes in a way which is easily understood by clients who are often bewildered by the whole experience.’
The Legal 500 UK Bar 2026
‘Sian has a relaxed style supported by preparedness and excellent legal knowledge. She is a strong advocate in court, direct and passionate about representing clients and children and protecting those at risk.’
The Legal 500 UK Bar 2025
‘Sian is a fantastic cross-examiner. She is brilliant with the details.’
The Legal 500 UK Bar 2025
"Sian is a dedicated family lawyer and a conscientious, safe pair of hands whoever she is representing."
Solicitor
We offer our warmest congratulations to Sian Cox of Harcourt Chambers who was Highly Commended, in a very high quality shortlist, in the Family Law Junior of the Year category at last…
Sian’s article on transparency has been published in Family Law Journal [2025] Fam Law 1033 September 2025.
In her article, Sian explores how family law cases have been reported on…
We are delighted to announce that Harcourt Chambers and a number of our members have been shortlisted as finalists in the prestigious 2025 Lexis Nexis Family Law Awards in the…