I’ve used reflective window films in my flat for a while now, and they work really well. I
checked
https://www.tintfit.com/shop/reflective-window-film
and here I found a variety of films designed to give privacy without making the room feel
closed off. During the day, people can’t see inside, but you can still enjoy the view
outside. It’s a subtle solution that keeps the room bright and open while providing
privacy — perfect for UK homes with street-facing windows.