Sainsbury's will introduce trained security guards at its stores to challenge people not wearing masks or shopping in groups. 

It comes after a successful trial over the weekend and the prime minister saying people needed to “do the right thing” by adhering to social distancing when out.

Sainsbury's has four Swindon locations including Bridgemead and Stratton.

Simon Roberts, chief executive of Sainsbury’s, said: “I’ve spent a lot of time in our stores reviewing the latest situation over the last few days and on behalf of all my colleagues, I am asking our customers to help us keep everyone safe.

"The vast majority of customers are shopping safely, but I have also seen some customers trying to shop without a mask and shopping in larger family groups.

"Please help us to keep all our colleagues and customers safe by always wearing a mask and by shopping alone.

"Everyone’s care and consideration matters now more than ever.”

The supermarket chain has also reduced the number of customers allowed into stores at any one time and will have more hosts at the front of stores supporting with cleaning and social distancing.