With this bizarre appointment front of mind, I did something I never do earlier this morning on my way through Heathrow Airport....I stopped and entered a Dixons "Tax-Free" store at T5.
Now the target ('captive') customers here differ greatly from the elderly and uneducated that DSG-run stores normally target with legal fraud, so maybe there'd be a different approach, a different mentality, a different experience...
...I lasted less than 60 secs. Horrific.