Grocery market share in Great Britain 2017-2022
Tesco and Sainsbury's had the largest share over the period under consideration, holding 42.2 percent of the market together as of June 2022. Prior to the popularity of the discounters, the grocery retail market was dominated by the 'big four' supermarkets: Tesco, Sainsbury's, Asda, and Morrisons.
On the back of the post-Brexit uncertainty and growing inflation, however, consumer behavior has shifted in favor of cheaper alternatives such as Aldi and Lidl.The resulting 'price wars' have led to supermarkets lowering their prices. Crucially, this has caused increased volatility in the grocery retail market and, as of January 2017, Aldi overtook the Co-operative to become the fifth largest supermarket in the United Kingdom. After a period of intense competition Lidl overtook Waitrose and went on to overtake Co-op for the first time at the end of 2020.