Londoners used to account for less than 30% of the customers, now they’re more than 60%.
The retailer added that it was looking forward to a successful Christmas, which is traditionally its strongest trading period.
"All the signs suggest we are going to have our best festive season on record," said chairman Kate Hobhouse.
"Looking to the future, we know we can’t afford to rest on our laurels and we will continue to invest in the business to provide our customers with the best possible experience, in-stores and online," she added.