Sounds awful. I'd be inclined to rig up a security light which would light them up in all their glory if they tried to use my hedge as a public convenience.

Well, I've heard of it being good for the compost heap, but haven't any experience of it.

Reminds me of the fact that when you are hiking in blissfull solitude for hours deep into the woodland, just take a pee and as you are doing it, out of nowhere someone will show up.

It can work if there is plenty of rainfall to wash out the salt. It shows that the hedge is lacking nutrients, though!

Urine in compost, yes, urine around plants no, is the simple answer as Tugb. says you'd need a lot of rain t wash out the salts.

Probably want to use some good compost--with or without urine--on the remainder of the hedge. Maybe some Growmore, too, though I would try the compost first, since the soil in northwestern Europe holds nitrogen so well. As MG has instructed me, it is easy to overdo fertilizer there!

It would seem that urine contains a lot of nitrogen and especially potassium, which the body is unable to store. In certain parts of Europe, I believe, they use it, watered down, to feed their tomatoes. Not the sort of thing that you would want to tell your friends if you were to give them some of your home-grown tomatoes.

Thank you all for your kind thoughts and yes I may redirect one of the security lights on my visitors.