Dear wise-ones, I don't know the name for the thing that I am looking for (or it exists) but hoping that someone here does...
We have a kitchen door that goes into a sunroom and for light/space reasons it would be so much better if we had a double door instead of one single door that takes up too much room when open (nearly all the time except for when v. cold in winter).
I'm guessing that for building regs we need an external door because it opens into the sunroom and I can't see anything similar but I'm hoping that's because I don't know what it's called