Couldn't find this discussed elsewhere. Where employees are paid hourly you can select to calculate on the basis of same period last year or average earnings. Are you able to switch between the two bases for claiming? If not, it makes it difficult to assess which approach is more beneficial as we obviously don't know how long this scheme is going to last, but being able to switch would allow you to effectively claim more than the employee has been paid overall (even at 80% potentially).
Thoughts? Can't find any explicit guidance.