I have noticed that in the government's Policy Paper, which I believe is all the detail we have so far, it states under section 5.1:
"Claims should commence from the LATER OF the date that the employee starts working reduced hours or the date when working reduced hours is confirmed in writing, not when the decision is made."
In section 2.3 they go on about the JSSO agreements and how they should be put in place, what they should include etc. Although they do say further guidance on the content is to be published by the end of October!
So if I am reading this correctly (always questionable) for a client to claim under JSSO from 1 November they have to have consulted employees and put these temporary reduced hours written agreements in place by the end of October. If the agreements are put in place on say 3rd November, then the claim can only run from that date even if the employee started working reduced hours on the 2nd. (I know we seem to be working on calendar days again which is a bit of a wrinkle).
Bit harsh given the policy paper was only published last Thursday to expect employers to have this all thoroughly consulted and documented by the end of this week!