Diarmuid is a barrister at 4 New Square Chambers and conducts a wide range of commercial litigation specialising in insurance, professional liability, construction, fraud and sports law.

Described as “an excellent advocate” with “Excellent drafting skills“ and “a hands-on operator who is not afraid to seize the narrative and craft effective strategy“, Diarmuid is ranked as a leading junior by the Legal 500 in insurance and reinsurance, and sports law.

Recent examples of Diarmuid’s work in sport includes:

• Acting for a governing body before the Court of Arbitration for Sport in its appeal against a First-Tier Tribunal’s finding that the athlete had not committed an ADRV as a result of three whereabouts failings in a calendar year (decision pending).
• Acting successfully for the governing body of an Olympic Sport in a dispute regarding team selection for the European Championships.
• Advising a trans athlete regarding new guidance issued by a governing body on the participation of trans athletes in the sport.
• Acting for a national betting company in a dispute as to whether a number of substantial bets are payable under the company’s standard contractual terms.
• Advising the owner of a stud farm on claims in negligence against Northern Irish and English veterinary surgeons who produced pre-purchase veterinary reports on a competition horse.
• Successfully defending a national governing body in a challenge to its refusal to admit an athlete to its high performance programme.
• Successfully defending a professional athlete against charges of possession and attempted use of a prohibited substance at a multi-day hearing before the National Anti-Doping Panel.
• Successfully prosecuting an underage athlete on behalf of a national governing body for use of a prohibited substance, leading to a 4-year ban under the WADA Code.
• Acting for the Appellant before the National Anti-Doping Panel in Hosseinpoor v UKAD (SR/NADP/667/2016), in which the Appellant was granted a 50% reduction in his two year additional sanction for training in breach of an existing anti-doping ban.