I've been searching for this for ages and I thought it may be useful to post:
childlawadvice.org.uk/coronavirus-separated-families-and-contact/
The bit I particularly noticed was this:
What if my child and/or I have to self-isolate/quarantine?
Regulation 2 The Health Protection (Coronavirus, Restrictions) (Self-Isolation) (England) Regulations 20200^ states that if an adult or child has tested positive for Covid-19 or has come in close contact with someone with Covid-19, they are required to self-isolate. You are also required to self-isolate when travelling back to the UK from abroad, unless that country is exempt. You can see that guidance heree^.
The regulations state that where someone is required to self-isolate, they must remain in:
• their home;
• the home of a friend or family member;
• a bed and breakfast accommodation, accommodation provided or arranged under section 4, 95 or 98 of the Immigration and Asylum Act 1999(1) or other suitable place.
That person self-isolating must not leave the above specified places, except where necessary. The regulation does NOT list visiting a parent whom a child does not usually live with as a reason why a person self-isolating may leave the house.