Thank you for replying to me.
Sadly, where I live in the north east of England, and also in other parts of the UK, horses are tethered for very long periods of time. I totally understand that if done properly by caring owners, that it is probably very appropriate at times, even necessary.
However, there are public areas of land around here where owners will "park" their horses, and yes they are there for days and sadly weeks. I have been keeping my eye on one horse and he has been there for at least 3 weeks now. He has a bucket and he moves around the grassy area occasionally, so the owner must come and tie him up somewhere else so that he can have fresh grass.
But he has been tied up and stands alone. We recently had gale force winds. He has no shelter.
I see a lot wrong with this. It can't be right. But these people sadly get away with it.