Burberry saw UK like-for-like sales race more than 30% in the three months to 30 September after the plunging pound saw overseas shoppers rush to London to snap up luxury goods at a better price.
Shoppers from China and the United States in particular have been travelling to the UK to hit the shops, according to the group.
It came as a welcome boost to Burberry and helped the group return to overall sales growth in its second quarter, up 2% against a 3% fall in the previous three months.
It said recent further falls in the pound were also now expected to add around an extra £125m to full-year profits, up from July's estimate of £90m.
Carol Fairweather, chief financial officer of Burberry, said the group was "delighted" with its sales performance in the UK, which accounts for around 15% of group-wide revenues and some 40% for the European region.
She said sales to Chinese shoppers in UK stores were up more than 20%, but added that the group also saw a recovery in demand from British shoppers over the summer.
Sales of designer bags were strong in particular, she added, especially Burberry's new equestrian-inspired satchel, the Bridle Bag.
Its second-quarter sales hike marks the group's first like-for-like growth for a year.