He never identified himself as an employee of the company and had no right to see it. No notices were present to say that a condition of shopping at the store was that they retained the right to ask to see your receipt on exit, and as far as i am aware to detain someone on suspicion of committing an offence requires evidence. Refusal to show a receipt to a complete stranger is not sufficient grounds for detention.
they did detain me, they took my trolley which was full of my property, refused to let me go, marched me back into the store through the main entrance and insisted i remain in their security office whilst they investigated. They posted a guard outside and i felt afraid and intimidated which is why i insisted they call the police.