The official advice is:
"Social distancing measures are steps you can take to reduce the social interaction between people. This will help reduce the transmission of coronavirus (COVID-19).
They are:
Avoid contact with someone who is displaying symptoms of coronavirus (COVID-19). These symptoms include high temperature and/or new and continuous cough
Avoid non-essential use of public transport, varying your travel times to avoid rush hour, when possible
Work from home, where possible. Your employer should support you to do this.
Avoid large gatherings, and gatherings in smaller public spaces such as pubs, cinemas, restaurants, theatres, bars, clubs
Avoid gatherings with friends and family. Keep in touch using remote technology such as phone, internet, and social media
Use telephone or online services to contact your GP or other essential services
Everyone should be trying to follow these measures as much as is pragmatic."
Bear in mind that social isolation is harmful both mentally and physical, so people's definitions of pragmatic may vary. If you don't like how they define it, you don't have to associate with them, and nor does anyone else.