People in the UK have to stay at home, except for: shopping for basic needs; exercising a maximum of once a day; travelling to and from essential work; any medical need
Non-essential shops and public places must close - this does not include parks, but does include playgrounds and other "communal spaces" within them
All public gatherings of two or more people are banned - except when essential for work, or when those people live together (eg a family with children going to the shop)