According to https://www.legislation.gov.uk/uksi/2005/1541/contents, the Regulatory Reform (Fire Safety) Order 2005 significantly reformed fire safety law in England and Wales, replacing the previous fire certification regime with a requirement for responsible persons to conduct fire risk assessments. According to https://www.legislation.gov.uk/uksi/2005/1541/contents, this legislation, enacted in 2005, addressed the broader 'state of uncertainty' regarding fire certification. No specific evidence regarding the application of this law to underground stations or any further specific steps taken to resolve uncertainty for these particular premises has been identified in the provided sources since 2005.