Ivy climbing on neighbour's wall
I have a fence covered in ivy that has climbed onto my neighbour's wall (neighbour's is to the left of my house) and the fence is to the side (not back).
I have never had this issue in 6 years, the growth may have been facilitated by the warm summer and by the light.
My neighbour is expecting for me to sort this out and to get someone round to her to cut the ivy and for me to pick up the tab. She is basically assuming that the ivy comes from my side.
My problem is that I am not sure where the roots of the ivy are, meaning that it may well be their ivy, too (I can see a thick branch coming from their side, creeping through the wooden fence). I am worried that if I cut the ivy on their side, I will be setting a precedent and I will then be expected to do this again if the problem reoccurs.
Any advice would be greatly appreciated: shall I get rid of the ivy altogther?
Thanks in advance.