Thing is, if there was a problem (someone slips and breaks their neck), the hse would not be interested in what the Lidl manager said or what it says in a daily telegraph from 7 years ago. No, what the hse will want to see is risk assessments and method statements. Firstly, were they sufficient, secondly were they followed.
If your risk assessment (or even a health and safety meeting) says don't put grit down because you might be admitting liability, my missus says so: You. Are. Screwed.