I wanted to say thanks for everyone's advice on the insurance angle. If you're interested in subsidence and its impact on neighbours, insurance, etc I recommend the free book that nunhead_man mentions. We bit the bullet and made a claim having taken legal advice from Which? (fab), the Financial Ombudsman (who regulates insurance firms - also v helpful), and the Financial Services Authority (a waste of space and capital letters). We followed this up with a deadening, half-hour slog on the phone to the insurer, which included such exchanges as: Q: "Why did you earlier inform us about the crack but not make a claim at that time?" A: "Err, should we have?" Q: "Why did you say earlier that the tree was Type X but now say it's Type Y?" A: "We relied on an official report that turned out to be wrong. Sorry for not being telepathic." Q: "I can get someone from the complaints department to phone back tomorrow evening. Is that OK?" A: "No. We want an underwriter to overturn (!) the decision to refuse us insurance, not a customer service rep to witter on and on, and then lose our email." I exaggerate, but you get the idea. It was all very galling. Hopefully, the time we spent on the phone tonight will make a difference but I fear we will need to walk away from our current insurers and call on the services of a broker to fight our case. I have the name of an excellent one, if anyone needs a recommendation. Now, watch our premiums soar!