Budget supermarkets Aldi and Lidl have hit a combined market share of 10% for the first time, marking a doubling of their share of the grocery market.
Retail researchers Kantar Worldpanel said Aldi's market share rose to 5.6% in the 12 weeks to 8 November, while Lidl's grew to 4.4%.
The figures showed that Sainsbury's was the only of the 'big four' supermarkets to increase its market share during the three month period. That increase also saw its overtake Asda as the UK's second-biggest supermarket. Tesco remains the largest at 27.9%. Sainsbury's (16.6%) edged ahead of Asda (16.4%), while Morrisons lags behind at 10.8%.
The Co-operative group sits at 6.3% and Waitrose has a market share of 5.2%.
Fraser McKevitt, head of retail and consumer insight at Kantar Worldpanel, said: "If you look back as recently as 2012 Aldi and Lidl only held a 5% share of the market, and it had previously taken them nine years to double their combined share from 2.5%.
"In the last 12 weeks, the two retailers have attracted another additional million shoppers compared with last year, while average spend per trip has increased by 4% to £18.85, which is 78p ahead of the total retailer average.
"The discounters show no sign of stopping and with plans to open hundreds of stores between them, they'll noticeably widen their reach to the British population."
Both Aldi and Lidl continued to see a strong rise in sales during the period, 16.5% and 19% respectively.