What happens if you've booked a repeated cleaning service and one of the appointments falls on a bank holiday?
In principle, nothing: the cleaning goes forward as planned! If your pro isn't working that day, they'll cancel the appointment on their end ahead of time, and you'll be informed. Likewise, you can cancel on your end if you don't want the service on that day.
In any case, we suggest that you discuss it with your pro a few days in advance. You can also agree to change the date of the appointment in question, which can be done through your client area.