I rent a Housing Association flat. It is a fairly big estate but only a few buildings are Housing Association. The rest of the estate is managed by a private company.
There is a boundary hedge between our block of flats and the car park. The car park is managed by the private company. They say they are not responsible for the hedge. The housing association also says it is not responsible for the hedge. As a result nobody has done anything with it in five years. It is an eyesore, it has grown over the parking spaces and in the summer there are a lot of wasps' nests. It also just gets in the way in that you have to walk around the thing when you go in and out of the building.
Given that no one apparently owns it or wants it, could I just pay a gardener to come and remove it? I know I could pay for it to be cut but I'd then need to keep doing that.
I would tell the housing association and the management company what I am going to do, obviously, but if it's not theirs they can't object. If it is theirs (whosever it is), they can sort out the maintenance.