The grocer launched the trial at its Botley Road shop in Oxford in June this year, taking more than 200 products out of their packaging to “test how customers might be prepared to shop differently” with the aim of reducing plastic usage.

The trial, which was due to finish on August 18, has since been extended in Oxford and will also be rolled out to three new stores in Cheltenham, Abingdon and Wallingford over the course of the remainder of the year.

Waitrose said more than 7,000 customers responded to the trial in Oxford, and the findings “give the supermarket confidence that the concept can be a success elsewhere”.