BB, they came about a year ago and said they could fit one. However, our steps are very narrow. I'm not sure I or the others would still be able to get up and down the steps with that in the way. I've done a bit of digging and it says place a chair against the door facing forward which I have done but there is only a tiny bit of space left.
Also, is it operated by a lever or a button system normally if anyone has one? Mum wouldn't be able to use either as her joints are quite bad.