The document provides responses from an expert helpdesk to various questions about NHS contracting regulations and policies. The questions cover topics like eligibility for APMS contracts, practice advertising on social media, subcontracting PCN services, electronic signatures on contract variations, director retirement requirements, changing a GOS contract to a company, reversing a pharmacy sale, allowing a company-to-company GDS contract change, and optical supplier contracting requirements. Concise answers are provided addressing the specifics of each question.