I'm sure that businesses come and go in your trade but your Company has been in existence for a long time. My recent experience demonstrates why this is the case.
Our 30 year guarantee had almost expired when we recently discovered woodworm infestation in the previously treated roofing joists. I understood why you wanted to charge the refundable fee for the survey and took the risk in requesting it. However, I anticipated that you would attempt to "wriggle" out of the guarantee and was ready for an argument with your surveyor. My cynicism was totally unfounded. Your surveyor efficiently identified the problem and confirmed that the area would be re-treated - I didn't have to say anything. Your operative subsequently did the treatment work efficiently and with a high standard of housekeeping. In both cases, they were friendly and courteous.