Are you being honest with the school and asking for an authorised absence or just phoning in sick? Nearly every year at DC's school has now been told to self isolate. They have 3 days left and we are due to go on holiday in the UK the week after term breaks up. I am really really dreading getting a call telling us to isolate and think DC would be gutted to miss their holiday after what's already been a weird year for everyone.
My DC is in reception, on track with learning, and I will homeschool happily for the few days missed, though it looks like not too much is happening on those days anyway. They're beyond compulsory school age, but are schools fining for unauthorised absences at the moment? I'm a rule follower so really really feel awful about taking DC out of school, but I do think it's the best option at the moment.