For context, I am renting a property from my dad, which I will buy once my divorce money comes through.
About three years ago, my neighbours removed a hedge which provided privacy between our two gardens, and replaced it with a fence that is waist height. They asked my permission and I agreed, because I naively assumed they would be replacing the hedge with a fence of a similar height.
I have absolutely not one shred of privacy in my garden as a result of their actions. A few weeks ago, I informed them that I will be planting a hedge for privacy. Three days ago, they informed me that they are going to increase the height of their fence (they don't want me to plant the hedge, I don't think).
I still want to plant the hedge - can I legally do this if they increase the height of their fence, or will that have legal implications for me, given that I won't be able to maintain the fence, and the hedge could damage their fence? I don't know who is responsible for that particular boundary, but will try to find out today.
Thanks to anyone who can advise me.