have a potential diversification that my wife is interested in taking forward that would need one, pretty sure it would fall under agricultural / horticultural use though, she has more time on her hands now our children are a bit older and at school full time, very much at the research and feasibility stage right now however
Used mine back in the day for lambing sheep then switched it to growing cucumbers, peppers, red & yellow tomatoes and aubergines.
If your missus is thinking of it as a sort of greenhouse, remember it will get very hot in summer so it would be worthwhile installing an automatic timed sprinkler system.
Also once the plastic starts to go, it's goosed. Expect 5 years max life before the sun destroys it unless you are thinking of green cladding rather than plastic.