No specific, verifiable evidence detailing London Underground's policy or actions to prevent alterations to station operations rooms or supervisor's offices that would reduce communication and control effectiveness has been provided in the input. Searches on gov.uk for "Fennell Inquiry recommendation implementation" and "london underground shall" indicate the existence of related official documentation, but specific content for FENN-70 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.