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Sioned Davies

Sioned Davies

Year of call: 2019

Practice areas: Planning, Environment, Compulsory Purchase and Compensation, Local Government, Major Infrastructure Projects, Public Law

Sioned Davies

As a second six pupil, Sioned welcomes instructions across all of Chambers’ practice areas.
Sioned was called to the Bar in 2019 and commenced pupillage in the same year. She is currently under the supervision of Melissa Murphy, having spent 4 months under the supervision of Ned Westaway. In appropriate cases, Sioned is happy to work on a pro-bono basis.

Prior to commencing pupillage, Sioned graduated with first-class honours in Law from University College London and then undertook a specialist Master’s programme at the University of Cambridge where she was ranked 1st in the faculty.  She has developed an interest in diverse practice areas in planning and infrastructure, environment and agriculture.



Since commencing pupillage, Sioned has gained a broad range of planning experience. This has included attendance with her respective supervisors at inquiries and call-ins as well as high court hearings.  Throughout her first six, she gained experience of: 
•    judicial review & statutory challenges; 
•    challenges to officer’s reports; 
•    lawful development certificates and permitted development;   
•    call-ins of the Secretaries of State and Welsh ministers; 
•    interpretation of planning policy (including the 2019 NPPF, green belt, heritage and listed buildings and affordable housing - mix and tenure); 
•    planning policy in Wales; 
•    enforcement matters; 
•    Planning Act 2008; 
•    National policy statement (NPS) interpretation; 
•    the infrastructure surrounding communications - 5G networks. 

Sioned has a keen interest in work in Wales having shadowed Morag Ellis QC to a called- in inquiry of the Welsh Ministers in respect of a large housing scheme. 

During her first six months of pupillage, Sioned undertook research for Melissa Murphy for a judicial review of the decision to develop the Westferry Printworks. She is currently assisting in the preparation for a public inquiry relating to a housing scheme in Devon and care home in Bracknell Forest. 


During her first six months of pupillage, Sioned shadowed the initial proceedings in R (on the application of Client Earth) v SSBEIS regarding the grant of a Development Consent Order (DCO) for the re-firing of the major gas fired power station in North Yorkshire. Sioned also shadowed Ned Westaway in the High Court permission hearing in Millstone v SSBEIS, a challenge to the new North London incineration plant. 
Sioned has conducted research on the use of the subsequent approval mechanism of the HS2 Act (Schedule 17) and drafted a Court of Appeal skeleton argument. 


Sioned has a particular interest in environmental law. Throughout her pupillage, Sioned has gained experience in the following areas. 
•    Climate Change Act and implementation of the Paris Agreement; 
•    Carbon capture readiness;
•    Habitats protection (SAC and SPA);
•    EIA and SEA; 
•    Aarhus costs claims 

Sioned also conducted research on mitigation and compensation measures relating to appropriate assessment (SACs, SPAs and Ramsar sites) and on the adequacy of the environmental statement connected to a wastewater treatment and major housing development.  

Highways, Rights of Way and Common land  

Under the supervision of Ned Westaway, Sioned gained experience on various rights of way matters including changes to the definitive map, footpath, bridleway and restricted byways. 

Sioned also undertook research in this area during her Master’s which included the potential impacts on common land in the context of an increasing public and private interest in financing carbon sinks. 

Local Government 

Sioned assisted in drafting an opinion for a local authority on the consolidation of traffic orders and the adequacy of consultation. 
Compulsory Purchase and Compensation 

Sioned has helped draft an advice in respect of the powers available to a local authority for a compulsory purchase in respect of an urban regeneration scheme. 


Bar Professional Training Course (BPTC) – Very Competent (2019)

University of Cambridge, MPhil Research Master’s – distinction and ranked 1st in Faculty (2018)
Specialised in environment, energy and climate change. 

University College London (UCL) – Law (LLB) – first-class honours (2017)
Highest mark in the undergraduate law dissertation and straight first-class marks during her final year.

Scholarships & Awards

Bentham Award for High Academic Achievement – for overall high academic achievement during the Law degree 

John Frederic Whitehouse Essay Award - for highest marks in the Undergraduate Law dissertation

Kate Bertram Prize – for first class results during MPhil degree. 

BPP Scholarship

CEDR Scholarship – comparative study in the implementation of the CAP in the EU.  

NFYFC National Chair (u20) – 2013 -2015

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Other Experience

Prior to commencing pupillage, Sioned was part of the secretariat team for the Climate Law and Governance Initiative at the UNFCCC COP24 in Katowice, Poland. This was a global collaboration between legal and financial institutions focused on scaling up capacity for climate mitigation and adaptation. 

Whilst at university, she was part of the founding team of the G3 Energy Conference between UCL, Imperial College London and the London School of Economics focused on bringing together students and industry leaders in the energy sector. 

She has also worked in a legal technology start up and gained experience in international and regional law firms. 

Sioned has a background in agriculture and is a previous Chair of a national agricultural charity. 

Professional Memberships

  • Planning and Environmental Bar Association
  • Compulsory Purchase Association
  • ALA


Sioned is a fluent Welsh speaker.