we are about to replace our very old south facing double glazed patio doors. In front of them our flooring (and half a dining table!) has discoloured from the sunlight and I’m keen to prevent this happening (will also redo the floor and table). I’ve seen film you can get for windows that reduce fading from UV light but I was wondering if that is just a gimmick and actually can you just buy windows that have even treated to reduce this? What should I be looking for? Thanks!