No specific, verifiable evidence detailing the extension of material use restrictions to other engineering departments or their application to contractors' work has been provided in the input. Searches on gov.uk for "Fennell Inquiry recommendation implementation", "restriction use materials", and "materials london underground" indicate the existence of related official documentation, but specific content for FENN-68 is not available. No relevant legislation has been identified on legislation.gov.uk. Given the inquiry's age (1987), and the absence of specific published evidence of action, the status is unclear.