I have had all my fire doors inspected recently following advice from my fire officer that the door seals on the frames required attention. The contractor who has been says that replacing the seals on the frames constitutes a major repair to the door and therefore the hinges will also need replacing (they are pre 1990 but are all in tact and in excellent condition) which means a cost of £230- £300 per door. I'm not sure that I am being advised correctly because everything I have read suggests the seals can be replaced really easily and that the hinges only need to be upgraded if damaged or if renewing the door. Can you help?

Ask for a copy of the fire door inspection report.  If the inspection has been carried out correctly, the report should detail all non-compliances separately for each door and describe the remedial works required.

It could be that the door leaf to frame and door leaf to threshold perimeter gaps are incorrect.

Thank you. The report is vague and doesn't give the detail you suggest it should. I have e mailed and asked for precise details about what needs doing and how this relates to the cost but no reply so I guess I have need to back to the drawing board and approach a different contractor. 

It would be better to engage the services of a Certificated Fire Door Inspector.