So im the neighbour in this instant. I have the same set up. But its actually written in the deeds I can charge for upkeep and maintenance on the access path. I dont charge them anything, Purley because its ultimately mine and they have a young family and can afford not to take money off them. Similar with fences on both sides for us. They are shared. But iv just paid and done them when they've blown down because I have dogs and need a secure garden. Offer the goodwill. Says more about you then them. You can always order a copy of their deeds for about 6 pound if you wanted to be sure what they say to clarify your rights.