While at Ofgem, Mark acted on a number of significant contentious and non-contentious regulatory matters for the energy sector including:

• Statutory appeal to the Competition and Markets Authority (CMA) of a modification to the charging arrangements for electricity generators; and on the subsequent judicial review of the CMA's determination.
• Judicial review of Ofgem's decision on the retail energy price cap; and a threatened judicial review of Ofgem's decision on the retail energy price cap for a later period.
• Judicial review of Ofgem's decision to change the charging arrangements for smaller embedded electricity generators, including defending application for an interim injunction brought at short notice.
• Insolvencies of energy suppliers, including on the applicable regulatory framework and advice on related strategic litigation including a successful out of hours application for a High Court declaration which was subsequently adopted in later insolvencies.
• Competition Act 1998 investigations including an infringement decision relating to the retail energy market and an investigation relating wholesale electricity markets resolved via commitments.
• Investigations and compliance activity relating to alleged market manipulation and insider trading in wholesale energy markets under the Regulation on Energy Market Integrity and Transparency (REMIT).
• Northern Ireland Renewable Heat Incentive Public Inquiry.  Representing Ofgem in this statutory inquiry under the Inquiries Act 2005 which considers issues relating to alleged flaws in the design and administration of a subsidy scheme.

Since joining the firm, Mark's experience includes:

• South East Water Limited on its appeal for redetermination of Ofwat's PR24 price control settlement.
• UK water companies on investigations by Ofwat into alleged breaches of regulatory requirements.
• A UK water sector body – on proposed primary legislation for the water sector.
• A financial institution – on public law and competition issues.
• A company in receipt of government funding – on Subsidy Control issues.
• UK energy companies on regulatory issues including investigations by Ofgem into alleged breaches of licence conditions.
• Participants involved in the funding or development of new carbon capture usage and storage projects.
• Charities focused on children and young people in their role as core participants in the Covid 19 Inquiry (pro bono).
• A charity on the Windrush compensation scheme (pro bono).