Apparently this is a thing. I Googled and it appears to be legal and fairly commonplace 
I've been renting my current home for a couple of years now. I keep it clean and tidy enough, but not show home pristine. Previous inspections have been quite cursory, no problems.
This time however, and without warning, the agent explained that they are now taking photos of every room in every rental to accompany the report they send to the LL. I refused to allow them to take any of the bedrooms.
AIBU to find the thought of strangers zooming in on mine and my DCs stuff unnerving? I get this happens all the time on Rightmove but at least then you get to double check you've hidden anything embarrassing before photos are published! 