“ a person participates in a gathering as a member of a qualifying group only if they are part of a qualifying group and, whilst participating in the gathering, they do not—
(i) become a member of any other group of persons participating in the gathering (whether or not that group is a “qualifying group”), or
(ii) otherwise mingle with any person who is participating in the gathering but is not a member of the same qualifying group as them.”;
www.legislation.gov.uk/uksi/2020/986/pdfs/uksi_20200986_en.pdf
Anyone understand what this means exactly?