Can I offer fixed viewing windows while the landlord sells the flat I still live in?

The agent's message arrived at 10:40: "Photographer can pop in at eleven. Just move anything personal out of shot."

I'm renting privately in England and have already given notice to move. The landlord wants to market the flat before I leave. I understand why an empty month would cost him money. I also work evenings, and at eleven I was asleep with laundry drying in the bedroom and a letter from my bank on the kitchen table.

Our agreement mentions reasonable access for viewings. We haven't agreed on photographs, arrival times or whether I have to leave during visits. I offered Tuesday afternoons and Saturday mornings for accompanied viewings. The agent said restricting availability would make the listing harder to sell.

[GOV.UK's tenant guidance](https://www.gov.uk/private-renting/your-rights-and-responsibilities) includes the right to live undisturbed. I need advice on how that and the actual agreement apply here; I don't want to turn a general rule about repair visits into my own confident ruling on sale viewings.

Is my proposed schedule a reasonable starting point? The request to make the flat available keeps arriving faster than I can get it presentable.