Ava Mayer

For Visa in its defence of multiple claims brought by retailers alleging that interchange fees applicable to card transactions are anti-competitive and breach Article 101 and Article 102 TFEU.

For Volkswagen AG in group litigation proceedings, arising out of what is often referred to as "dieselgate", which raise a number of EU and competition law issues, including in respect of the Commission’s decision regarding emission levels (with Brian Kennelly KC, Jason Pobjoy and Rayan Fakhoury).

For the successful respondents to an unfair prejudice petition regarding an English company holding shares in a major Russian insurer. The Court rejected the petitioner's case that it was in truth a 50/50 shareholder and inheritor of a quasi-partnership interest, following evidence regarding discussions between Russian principals over two decades (assisting Fraser Campbell).

For the claimant in respect of an oral contract, alternatively for a quantum meruit, arising from the supply of PPE during the pandemic (assisting Victoria Windle QC). 

For the claimant at a one day hearing challenging jurisdiction in a claim involving issues of breach of fiduciary duty, dishonest assistance and conspiracy brought against parties domiciled in five different jurisdictions (assisting Victoria Windle QC).

Dispute regarding ownership of substantial West London property, based on a disputed Declaration of Trust. Preliminary hearings regarding remote attendance, third party disclosure and adjournment on the basis of the disappearance of a key witness (assisting Fraser Campbell).  

For the claimants in a multi-jurisdictional fraud claim against 17 separate defendants, for damages of more than $1 billion. The claim raises issued of limitation, characterisation of loss and conflict of laws (assisting Victoria Windle QC).

For a defendant to a claim for fraudulent trading and breach of directors’ duties, valued at over £200 million and brought by administrators (assisting Victoria Windle QC).

For the defendant to claim of misrepresentation regarding the seven-figure sale by auction of a vintage racing car (assisting Fraser Campbell).  

For multiple defendants to breach of warranty claims following the sale of a chain of gyms (assisting Fraser Campbell). 

For Visa in its defence of multiple claims brought by retailers alleging that interchange fees applicable to card transactions are anti-competitive and breach Article 101 and Article 102 TFEU.

For Volkswagen AG in group litigation proceedings, arising out of what is often referred to as "dieselgate", which raise a number of EU and competition law issues, including in respect of the Commission’s decision regarding emission levels (with Brian Kennelly KC, Jason Pobjoy and Rayan Fakhoury).

For the Motor Insurance Bureau in the Court of Appeal, in a claim regarding the scope and effect of European Union motor insurance law (assisting Jason Pobjoy).

For Visa in its defence of multiple claims brought by retailers alleging that interchange fees applicable to card transactions are anti-competitive and breach Article 101 and Article 102 TFEU.

For Volkswagen AG in group litigation proceedings, arising out of what is often referred to as "dieselgate", which raise a number of EU and competition law issues, including in respect of the Commission’s decision regarding emission levels (with Brian Kennelly KC, Jason Pobjoy and Rayan Fakhoury).

Ava acted for the FCA (with Andrew George KC and Celia Rooney) in Upper Tribunal proceedings which, following a 4-week trial in 2022-3, resulted in important judicial pronouncements concerning the regulator's obligations to adduce factual evidence and the Upper Tribunal's jurisdiction to entertain allegations advanced by the FCA which were not part of its Warning Notice.

For the FCA in this case (with Andrew George KC and Ajay Ratan), currently on appeal to the Court of Appeal, which concerns the FCA's powers to impose requirements to pay redress on individual firms (in this case a requirement said to amount to $700m arising out of an alleged failure properly to manage conflicts of interests) and the Upper Tribunal's jurisdiction to permit amendments to the FCA's case after the issuance of a statutory notice and/or during Tribunal proceedings.

Advised the Medicines and Healthcare products Regulatory Agency in a proposed judicial review of its alleged failure to properly categorise a biomedical research company under domestic and EU law (assisting Fraser Campbell).

Advising an individual who had been arbitrarily arrested and detained incommunicado. The case raised issues of international law, human rights and torture (assisting Jason Pobjoy). 

For the Claimant in a successful claim challenging the Defendant’s operation of a blanket policy to seize, retain and extract data from the mobile phones of migrants arriving by small boat (assisting Jason Pobjoy)

Advised the trustee of a pension scheme in assessment with the Pension Protection Fund regarding its obligations to provide minimum levels of benefits to members of the scheme (assisting Fraser Campbell).  

Advising an educational institution on the restrictions on the right to freedom of expression that may lawfully be implemented within an internal misconduct and harassment policy (assisting Jason Pobjoy). 

For the Crown Prosecution Service in an action for civil recovery of property suspected to have been obtained through unlawful conduct (assisting Fraser Campbell). 

Written advice regarding the right to freedom of expression and the legality of restrictions upon it for the purposes of prohibiting discrimination (assisting Jason Pobjoy). 

For the Parole Board in judicial review brought by the first Parole Board member in its 54-year history to be removed for misconduct. Permission was refused in respect of complaints of procedural unfairness after an oral renewal hearing; reasonableness challenge to be heard in due course (assisting Fraser Campbell). 

For a family seeking reunion with a family member who had been granted asylum in the UK. The case raised issues regarding the Immigration Rules, Article 8 ECHR, and Article 3 of the United Nations Convention on the Rights of the Child (assisting Jason Pobjoy).

For the respondent Prime Minister and others in a challenge to the Prime Minister’s decision that the Home Secretary had not breached the Ministerial Code following allegations that she had shouted and sworn at civil servants (assisting Jason Pobjoy).

For Freedom from Torture in challenge to the UK Government’s refugee pushback policy on the basis that it was ultra vires and incompatible with the 1951 Refugee Convention and Articles 3 and 4 ECHR (assisting Jason Pobjoy).

For claimants in a challenge to the delays in NHS trans healthcare provision (assisting Jason Pobjoy). 

For the successful respondents in a challenge to Ministerial appointments during the Covid-19 pandemic (assisting Jason Pobjoy).

Advised the respondent public body on the merits of an appeal to the Judicial Committee of the Privy Council. The case raised complex issues concerning ouster clauses, procedural exclusivity, and breach of statutory duties (assisting Jason Pobjoy). 

For the BBC in a challenge to its framework for monitoring compliance with its due impartiality obligations (assisting Jason Pobjoy).