He has particular experience advising on competition collective proceedings; contractual disputes including involving complex financial products and regulatory and criminal investigations by the UK Financial Conduct Authority and Serious Fraud Office, with particular experience advising clients on bribery and corruption. Arnondo is one of very few lawyers in the market with expertise in advising on both contentious regulatory proceedings and corporate crime issues and is the only lawyer ranked in Chambers 2024 as an Eminent Practitioner in both Financial Crime Corporates and Financial Services Contentious Regulatory. He is ranked in the Hall of Fame in 2024 Legal 500 for Regulatory Investigations and Corporate Crime.
Arnondo also advises on public law issues and previously practised as a barrister at Matrix Chambers.
The directories say he is “completely unflappable, highly intelligent, strategically acute, and constantly thinks about his clients and what they need" (Chambers UK, 2021), “a tough litigator who fights hard for his clients” (Legal 500 UK, 2021); “very impressive and personable. Intellectually he is very strong and strategically savvy.” (Chambers UK, 2024).