Some of the union advice copied below. The last sentence is interesting! Note the bit about deep cleans, too!
At the moment, school closures are usually brief to allow activities such as deep cleaning to take place. Under no circumstances should members be told or volunteer to go into the workplace when it has been closed or engage in the deep cleaning. That is a matter for specialist cleaners who have the relevant training, experience and safety equipment.
These should be treated in a similar way to other enforced closures, such as inclement weather. There should be no detriment to members, and there should be no requirement to ‘make up’ the time that has been missed.
It is not unreasonable for teachers, if they are asked, to provide where there are facilities to do so work for pupils to do during the closure or provide remote/or online learning support. However, schools should not be imposing increased workload burdens on teachers in order for them to produce this work This does not mean any face to face meetings with pupils or returning to the closed workplace during the period of the closure to facilitate this.
School closures - long-term
Schools should have contingency plans in place should this occur, such as having work ready to send home, or utilising online homework platforms etc. Where preparations are being made for this time should be given during the working day for teachers to produce these resources.
Some schools are planning to use technology such as Skype but there can be no expectation that all pupils or indeed all teachers will have such facilities as the internet or appropriate equipment at home and nor can they be required to have them. Teachers may also not have the technical expertise to deliver such sessions. Preparing such materials can be workload intensive and the NASUWT expects schools to provide the time and support for teachers during the working day for any necessary preparation.
The NASUWT is also concerned that online sessions can be recorded and edited and this could lead to inappropriate postings on social media. Safeguards must be built in to prevent this and safeguard teachers and pupils who are participating and if teachers feel concerned about this they should not be required to deliver sessions in this way.
Where teachers volunteer to provide such provision, this should be seen as an emergency contingency only for a long duration school closure. There should be no monitoring of teachers’ performance. One-to-one sessions should also be avoided via video conferencing as this could present a safeguarding risk for both pupils and teachers.
Schools should also make it clear to parents that they should not be monitoring or commenting on the quality of the provision made.