The rules about Covid-19 and what we should and should not be doing seem to change regularly and it’s easy to get confused about what we can and can’t do. Age UK have some excellent, easy to follow advice about this. It can be found @ https://www.ageuk.org.uk/information-advice/coronavirus/coronavirus-guidance/
The Government website also has a resource using Frequently Asked Questions (FAQ’s) which will help you answer some of your questions. This can be found @ https://bit.ly/37jLR9d