Diarmuid Laffan > Chambers of Mark Cannon QC > London, England > Lawyer Profile

Chambers of Mark Cannon QC
4 New Square

Living Wage


Broad practice encompassing (i) commercial litigation and arbitration, (ii) sports law, (iii) insurance / reinsurance, (iv) professional liability and (v) construction. Diarmuid also accepts instructions in public / human rights law claims and was part of the counsel team in the landmark Supreme Court case of R v Jogee [2016] UKSC 8. Recent experience includes acting in a number of High Court civil fraud claims against professional advisers, and successfully representing a professional athlete before an arbitral panel against a charge of possession of a prohibited substance. Diarmuid regularly appears unled before the High Court, County Court and Sports disciplinary panels, and has experience of running substantial construction adjudications.


Called to the Bar (Middle Temple) in 2014 (Major Scholarship)






Undergraduate Law Degree (University College Dublin); BCL (Oxon)

Lawyer Rankings

London Bar > Sport

(Leading Juniors) Ranked: Tier 4

Diarmuid Laffan4 New SquareHis approach is incredibly professional and very strategic, distilling matters for lay clients.

A set with a ‘a very good reputation in the sports field‘, 4 New Square is active in sports discipline and anti-doping matters. 2019 silk appointment Daniel Saoul QC represented then-Toronto Wolfpack rugby league player Ryan Bailey, who was found to not be at fault for refusing a post-match drug test; the player suspected that bottles of water provided by the Canadian anti-doping authorities may have been interfered with. Kendrah Potts acted as sole counsel defending England cricketer Alex Hales in ECB disciplinary proceedings after his highly publicised involvement in a brawl after he and team-mate Ben Stokes intervened in a homophobic attack; Stokes was acquitted of affray in a criminal case arising from the same incident. Notably, a number of the set’s members have experience of elite sport themselves –Saoul QC is a former elite rowing cox, Graeme McPherson QC has had success as a race horse trainer, and Diarmuid Laffan is a former U21 Ireland rugby union international loose forward.