The Environment Agency require an initial healthcare waste pre-acceptance audit (PAA) to be provided to waste contractors commencing a new healthcare waste contract, or where more than 15 months has elapsed since the previous pre-acceptance audit:

https://www.gov.uk/guidance/healthcare-waste-appropriate-measures-for-permitted-facilities/waste-pre-acceptance-acceptance-and-tracking-appropriate-measures

The Clinical practice and waste storage areas across entire site must be audited to provide evidence and scrutiny of segregation and packaging systems, controlled waste documentation checks, security/storage, tracking and other aspects of the waste management system, for submission to your the waste contractor.