Here is some information you may find useful.
Summary of changes to the Ofsted Inspection Framework, from Third Space Learning. There is also an SLT’s guide to inspection, which you can acquire by providing your email address.
Guidance from Ofsted on expectations of conduct during an inspection, published on 4th March 2020.
Conference from the Westminster Forum about the new inspection framework, on 25th March: Agenda; Booking. Please note: I have been offered a complimentary ticket to attend this event.