Thanks Guys, keep it coming! I've spoken to 7 different local organisations. The most expensive is 700 quid a year. Some charge a one off figure for the survey, and then nothing. Some have raised their hourly charge by a few pounds to cover it.
It seems that the smaller the organisation, then the more expensive it is. I run a business which has nothing to do with aircraft ( thank God ) and I'd love to have a system which locked customers into me, I can't imagine them wanting to pay me for it though!