The doors to the Hall are what are called pocket doors. They were recommended by our architect as being the most suitable type for this situation. They slide right away into slots built into the wall so that the door opening is completely clear with nothing intruding into it.
This means that the Hall space can flow easily into the Ambulatory space to give a useful increased capacity for particular times, especially when there is a large gathering of people (in the post vaccine future!). The picture shows the doors being fitted. This was a tricky operation as they had to be carefully balanced on their tracks to make them run smoothly.
Barbara Sheard and Michael Carver