Got those London too. I believe at some point there used to be seven "American Candy Land" shops on the same one mile on Oxford Street. I think they replaced the shops selling cheap tourist trinkets and souvenirs that used to be all over the place.

Min you, not only is rent on Oxford Street horrifically expensive, but they all sprouted over Covid where, contrary to tourist trinkets, they could claim to be providing an 'essential' service as they're technically selling food. And the Oxford Street location allows them to claim absurd amounts of foot traffic without anyone batting an eye (despite the stores mostly being empty).

Also they tend to change ownership every year so they don't have to file tax statements to HMRC.

Edit=foot traffic, not food traffic...