As well as appearing in inquests themselves, Jason is often instructed in related proceedings in the Administrative Court. He is ranked as the “Star Individual” silk in this field by Chambers UK, sources noting that “He is extremely hard-working, incredibly intelligent and completely unflappable under extreme pressure.” (Legal 500) and "He's a consummate professional and leader for inquest work, who's amazing on his feet…He has an exceptional legal mind and is very strategic about the way he approaches cases."
He acts on behalf of coroners whose decisions and actions are challenged (appearing in the Court of Appeal in Maguire, the leading case on the extent and scope of the Article 2 investigative obligations in the coronial context). He is acting for the police service in the Fishmongers Hall Inquests. He appeared on behalf of the Ministry of Defence in the Porton Down Inquest into the death in 1953 of a serviceman who acted as a “human guinea pig” testing the Sarin nerve agent. He advised the Metropolitan Police Service on the public law aspects of the inquest into the 7/7 Bombings in London represented the Parole Board in the Naomi Bryant Inquest, and Surrey Police in the Surrey Puppy Farm Murders Inquest.
Jason also acts for individuals and corporation – he acted for the University of Manchester in three inquests into the deaths of academic staff who occupied the Rutherford Rooms at the University; for G4S in an inquest into the death of an employee shot by a colleague in Iraq; for an academy in an inquest into the death of a pupil following allegations of bullying at school; for a leading prep school in an inquest concerning the death of a parent on the school’s premises; and for Sheffield Wednesday Football Club in the Hillsborough Inquests.
Notable cases include:
R (Maguire) v HM Senior Coroner for Blackpool & Fylde  EWCA Civ 738
R (Hicks) v Senior Coroner for Inner North London (2017) 181 JP 1
R (McLeish) v HM Coroner for the Northern District of Greater London  All ER (D) 211
R (Independent Police Complaints Commission) v HM Coroner for Inner North London  EWHC 2681 (Admin)
R (Sutovic) v HM Coroner for the Northern District of Greater London  EWHC 1095 (Admin)
R (Ministry of Defence) v HM Coroner for Wiltshire and Swindon  EWHC 309 (Admin)
Regina (Hurst) HM Coroner for Northern District London  EWHC 1721(Admin)
Commissioner of Police of the Metropolis v HM Coroner for Southwark  1 WLR 371
HM Coroner for Wiltshire & Swindon v Ministry of Defence  EWHC 2567 (Admin)