FV Trident Inquiry Mrs. May To ask the Secretary of State for Transport what the estimated cost is of the FV Trident inquiry; who has responsibility for chairing the inquiry; and when he expects it to report. Dr. Ladyman Estimates for the total cost of the Trident RFI are around £2 million. The Sheriff Principal for Grampian, Highland and Islands will be chairing the inquiry. The timing of the inquiry is dependent upon the production of technical evidence required by the experts advising legal parties, and the report will follow thereafter.