Gavin was a supplier of Underworld's who tried to reach deal for a repeat order for fabrics for the firm in December 2021. Sarah Barlow like the material which Gavin claimed was "top drawer" stuff shipped in from Vietnam and put on a show of anger that she was insulting him with a low offer. His PA, Lydia Chambers saw through his act and smilingly told him to behave to which he claimed he was tired as his five-year old son Harry had been acting up that morning. This enabled Sarah to find common ground with him as she talked of her own son of an identical age. Gavin had to take an urgent call and left the far more amenable Lydia to negotiate a bulk order discount. Sarah confessed that she was sometimes frightened of the man but Lydia assured her that was the way he operated with everyone.
The meeting established a friendship between Sarah and Lydia which had several unexpected consequences. It turned out that at university in Edinburgh she had a relationship with Sarah's husband Adam when he was also a student there, she confessed she had had no other major relationships in her life and she had a son Finn who was of old enough an age to possibly be Adam's son. Adam himself was not pleased to see Lydia around and various circumstances led to him accusing her of keying his car. Upset by the allegation, she had too much to drink and turned up for second meeting between Sarah and Gavin much the worse for wear. He sacked her soon afterwards for her unprofessional behaviour and, feeling guilty, Adam arranged with Carla Barlow for Lydia to fill the vacant PA position at Underworld.