Four supermarket chains hold over 66 percent market share of the UK grocery sector. This report provides an overview of the UK retail outlets and guidance on how best to place U.S. products in the UK market. It also explains how COVID-19 has impacted the market and how consumer shopping habits have changed. Online grocery shopping has boomed and now accounts for 11.5 percent of all grocery sales. This sector has attracted more new shoppers in 2020 than it has in the previous five years combined.