LONDON, July 15 (Reuters) - Tesco TSCO.L , Britain'sbiggest retailer, will encourage both staff and customers tocontinue to wear face coverings from July 19 when new governmentrules state it will be a matter of personal choice, it said onThursday.

(Reporting by James Davey; editing by Alistair Smout) ((james.davey@thomsonreuters.com))