Leaders: if you are still doing or planning a "mocksted" or mock inspection of any kind, you should not do that.
I get that ofsted anxiety is high and legitimate. Genuinely. But this isnt the way. It's totally toxic, and I 100% guarantee staff will not see it the way you do, however much you say "don't do anything differently" or "this isn't for ofsted, it's developmental."
Trust me. Other routes to school improvement are available.