Ex-cop punched inspector he caught having sex with his wife in Screwfix car park, court told

Gavin Harper told a jury he "did not want to fight" the man he found having sex with his wife

A former police constable testified to a jury that he punched an inspector in self-defense after finding him engaged in sexual activity with his wife in a car's back seat.

Gavin Harper, 45, revealed that he tracked his wife's vehicle to a Screwfix car park in Birkenhead, Merseyside, on 16 February 2021, suspecting an affair between his wife, Stephanie Glynn, 40, and Andrew McLullich, 42, both Merseyside Police colleagues.

Harper, facing trial at Liverpool Crown Court for unlawfully wounding Mr McLullich and stalking Ms Glynn between December 2020 and February 2021, explained that he didn't intend to confront Mr McLullich with violence. Instead, he aimed to gather undeniable proof of the affair by filming the encounter.

Pc Stephanie Glynn, 40, was in a relationship with Harper for six years before they married in 2018. She told him their marriage was over and moved out in November 2020

He recounted opening the rear passenger door and filming on his phone, stating he wanted better footage to substantiate his claims. When asked if there were exchanges, Harper mentioned words like 'I’ve got you now, I’ve caught you now,' after which Mr McLullich reacted aggressively, leading to a physical altercation where Harper also defended himself.

Harper revealed that Ms Glynn, in the midst of the incident, pleaded with Mr McLullich to seize Harper's phone. Harper also mentioned his frustration over ongoing inappropriate communications between his wife and Mr McLullich.

The trial centers on allegations of Harper's obsession with the affair, leading to the violent confrontation in the Screwfix car park. Harper detailed his suspicions, including phone call records and conversations heard through a vehicle tracker, which corroborated his fears of infidelity.

In a phone conversation between Harper and Mr McLullich, the latter acknowledged inappropriate interactions with Ms Glynn but denied physical involvement. Harper was left distraught, feeling unable to confront his wife directly due to her denial of the affair.

Stephanie Glynn and Gavin Harper on their wedding day in 2018

The prosecution argues that Harper's obsessive behavior over the affair led to the violent encounter. Harper's defense asserts his actions were prompted by a genuine desire to uncover the truth, driven by the emotional distress caused by his suspicions and subsequent confirmations of infidelity.