Like-for-like sales increased by 11.9 per cent for the week ending June 17, compared with just a 4.6 per cent rise the previous week and an 11.2 per cent average for the year so far.
Father's Day, outdoor living and World Cup-themed products drove sales. The group said interest in flat-screen televisions continues, while womenswear and accessories sales took have taken a turn for the better.
A three-week summer clearance sale across all stores begins on July 1.
Summer weather and the World Cup continued to lift sales at supermarket chain Waitrose. Like-for-likes were up 12.7 per cent on last year, compared with an average of 9.8 so far this year.