Rory: Just performed a home inspection 2 weeks after a local you-kow-who did his home inspection. He missed a damaged chimney vent and reported jetted tub "not present." Seller swears the tub was not installed prior to my inspection. :) My fee is $100.00 more and identified more than $6K in repairs.
getting a referral is paramount. A professional inspector will stand by his inspections. I have in pass dealings, had to have the inspector come back to the house because he has missed a problem. He actually paid to have the problem fixed because he missed it and did not report it.