We live two doors down from our vendors. Routing everything through the estate agent, and formal writing, is producing all kinds of irritation, misinformation and conflict. However the vendor wanted it done this way (so do we in some respects) and I can understand why - otherwise it has the potential to become personal.
Ours isn't going brilliantly. We had a building survey, it said get quotes on roofing, chimney work etc. Did that, £20k, so asked for £5k discount on price. Vendor disagreed, got their own quote, £0. Now got to get another opinion and go around this loop again.