I agree. Its best , considering your concerns, to say no thankyou from the start. Our new neighbours are the given an inch take a mile variety. We have no access issues particularly but because we were easy going when they arrived they have parked their cars on our garden over the lane, attached their aerial and satelite dish to our hall chimney, damaging the roof. Connected to our water supply and had the use of our electricity for over a year now. They are paying per unit but it is the inconvenience and although the renovations are complete the reluctance to pay for their own connection. We have now given them 2 months to get it sorted or we pull the plug. This has soured relations and why I didnt want to really get involved in the first place, but when people say pretty please face to face it is so hard to say "No" most of the time. I tried but after much pleading gave in. Its virtually impossible to stop these things when they are started and has caused us much grief that we could have well done without and im sure its not over yet. So be firm and say "No " from the outset to keep your sanity . They will get over it and if they dont then their friendliness was just based on getting what they wanted from you and nothing more.