Genuinely not sure what's fair here. This is the basic situation.
Neighbour A has a long garden with an evergreen hedge of conifers and yew trees down one side. Garden is on a slope so hedge at the top is about 3-4m tall and at the bottom is about 7-8m high. The conifers have been shaped and look nice. Yew which is taller is a bit sprouty as it hasn't been cut for several years (it's really high and hard to cut).
Neighbour B's garden backs on to the side of A's garden. B has a small garden (approx 9m long) which is further down the slope so the hedge looks even taller (it's higher than the roof of B's house).
B would like A to significantly trim the hedge. A has said yes but only the yew and only by 1-2m and only if B pays for it.
B feels that in some ways it's fair for B to pay as they are the ones who want it cut BUT it is A's hedge and the reason it is so unruly is because it hasn't been maintained.
Neither neighbours want to go to the council because of the stress etc and this would cost money (£400) anyway (if they did, the likelihood is that the entire hedge would have to be significantly reduced but no one wants it to be acrimonious. Currently thinks are friendly.
What do you think!?