YouGov BrandIndex screened all of its 1,549 brands for their Recommend score, which asks customers of a given brand: "Would you recommend the brand to a friend or colleague?", thus giving the proportion of a brand's customers who are willing to recommend it to others.

The ranking data was collected between January 1, 2019 and December 31, 2019. All brands must have a minimum N of 100 and must be tracked for at least 12 months to be included in the ranking.

All Recommend scores listed have been rounded to a single decimal place; however, we have used additional precision to assign ranks.