- Berge Larsen (1) Volaw Trust (2) v. Office of the Comptroller of Taxes (Privy Council, Jersey) legality of Disclosure Notices in foreign tax proceedings and application of the privilege against self-incrimination under Article 6 P v. Metropolitan Police (EHRC intervening) (Supreme Court), acting for EHRC as intervener on appeal concerning disability equality claims following dismissal of a disabled police officer.
Onions was prosecuting Counsel in the leading case of Sterling Homes v Birmingham City Council.
He has prosecuted for Of com in cases involving the RTT&E Regulations and the EMC Regulations, He appears regularly in food safety and hygiene cases, including cases for and against McDonalds Restaurants Limited,
Greene King Plc and notably for the prosecution in the food poisoning case against Cadbury Ltd.