They will be open. This is from the gov.uk website:
Businesses and venues which can remain open
Other businesses and venues are permitted to stay open, following COVID-19 secure guidelines. Businesses providing essential goods and services can stay open. The full list of these businesses can be found in the guidance on closing certain businesses and venues in England, but includes:
essential retail such as food shops, supermarkets, pharmacies, garden centres, building merchants and suppliers of building products and off-licences
market stalls selling essential retail may also stay open
businesses providing repair services may also stay open, where they primarily offer repair services
petrol stations, automatic (but not manual) car washes, vehicle repair and MOT services, bicycle shops, and taxi and vehicle hire businesses
banks, building societies, post offices, short-term loan providers and money transfer businesses
funeral directors
laundrettes and dry cleaners
medical and dental services
vets and retailers of products and food for the upkeep and welfare of animals
animal rescue centres, boarding facilities and animal groomers (may continue to be used for animal welfare, rather than aesthetic purposes)
agricultural supplies shops
mobility and disability support shops
storage and distribution facilities
car parks, public toilets and motorway service areas
outdoor playgrounds
outdoor parts of botanical gardens and heritage sites for exercise
places of worship
crematoriums and burial grounds