No specific government response or implementation reports directly addressing the "Hidden Inquiry" or the provision of appropriate feedback to drivers reporting signalling irregularities have been identified in the provided public evidence. While general searches on GOV.UK for "Hidden Inquiry recommendation implementation" yield numerous results, no specific documents detailing actions taken in response to this recommendation are available in the provided snippets. The inquiry appears to be historical, with one recommendation (HIDD-54) referencing a completion date of April 1991.