Here is how according to the Gov.uk website shops will be helping to keep you safe.
Defining the number of customers that can reasonably follow 2m social distancing within the store and any outdoor selling areas. Take into account total floorspace as well as likely pinch points and busy areas.
Limiting the number of customers in the store, overall and in any particular congestion areas, for example doorways between outside and inside spaces.
Encouraging customers to use hand sanitiser or handwashing facilities as they enter the premises to reduce the risk of transmission by touching products while browsing.
Encouraging customers to avoid handling products whilst browsing, if at all possible.