Ask around first about the reliability of the surveyor - I had a survey done in August and paid up the £400 immediately as per the contract I signed. After many repeated phone calls, emails, letters and threats of legal action, I finally got the survey report last week - 4 months after it had been done. And now I find the fuel tank is leaking and has been for several years according to someone who I've found that has worked on the boat before - something I would have thought the survey would have picked up.