Nell, I have been wondering about a horticultural use too which could explain the outbuildings, maybe gardens open to the public, it is before the days of garden centres. I think the netting is attached to the outside of the greenhouse for shade purposes.
If you look at #10 of this thread, I think the greenhouse is set further back than it appears. In front of the greenhouse is a flower border, then a lawn area, before the other flower border near the two bushes and dog.
If you look at the side of the house with the climbing plant you can see at least one window open, there is also a dark shape above the glass house roof level, which could be another open window.
Also on this thread #10, can be seen a radio mast, (an inverted V shape among the trees) above the roof of the back building, it has not been mentioned for a long time. I wonder if there is any significance to the use of this property and is the lookout tower associated with it.
Pat