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Tesco is taking Asda market share, according to Kantar Worldpanel

Tesco's return to growth appears to be taking market share from Asda.

That's according to the latest figures from Kantar Worldpanel, which show that the sector as a whole is still hugely competitive, with the grocery price war driving supermarket deflation to a record level of 1.6 per cent for the 12 weeks to March 1.

Tesco has posted its strongest performance in 18 months, with the UK's biggest retailer growing sales by 1.1 per cent, with its market share now down just 0.1 percentage points on last year.

Sales at Asda, meanwhile, were down 2.1 per cent, and its market share dropped by 17 per cent.

Kantar Worldpanel's head of retail and consumer insight, Fraser McKevitt, said: “Among the big four supermarkets,Tesco has been the stand-out retailer.This resurgence has impacted Asda, which competes for many of the same shoppers as Tesco.'

Morrisons and Sainsbury’s both grew behind the market average, with sales falling by 0.4 per cent and 0.5 per cent respectively in the period the data covers.

Discounters Aldi and Lidl, and premium grocer Waitrose, all continue to grow, with sales up 19.3 per cent, 13.6 per cent and 4.9 per cent, respectively.

Although Aldi experienced its slowest rate of growth since June 2011, it has reached a record five per cent market share, although Waitrose has kept ahead with 5.2 per cent of total spend.