I rent out a house that I used to live in. It's been 10 years since I lived there and 17 years ago I had the garden totally landscaped and replaced the fence between me and my neighbour. The old fence was really low - around 4ft- and I wanted it to be 6ft. We compromised on 5ft with a trellis on the top - they agreed as long as the trellis was concave topped so it dipped down in the middle. I agreed by thinking shrubs etc would eventually grow taller anyway.
The shrubs planted along the fence line were young plants back then. They are now mature and taller than the fence.
The neighbour is now complaining to me that the shrubs are too tall. I have seen photos and they are taller than the fence, but not unreasonably so. They are neat and tidy. The agents carried out an inspection last week and noted that the garden is being kept in very good order by the tenants. They are retired tenants and they told me it was the garden that sold the property to them as they love gardening.
I don't have a measured height for the shrubs but I would say they may be over 6ft. I have had a look at the guidelines for nuisance hedges and being over 6ft is the first requirement if they were to launch an official complaint. (There are many other things they take into account such as proximity and angle to the house, etc but it has to be >6ft for it to even be considered.)
The tenants want the shrubs to be kept higher as they prefer the greater privacy that the taller shrubs give (it stops the slightly nosey neighbour looking over when they are in the garden)
The neighbour has previously complained about a silver birch tree putting their garden in the shade, and I did get that cut back as I agreed it was getting a bit big.
Am I being unreasonable to ignore them (at worst) or (at best) reply saying that I won't be getting the shrubs cut back as the tenants are keeping the garden in good order, and they have recently trimmed them to a height they are happy with. I have asked the tenants to contact me if the shrubs get unruly or to a height they can't maintain and I will then get a gardener in.