Enquire about each agent's marketing approach, including their presence on property portals, social media marketing, and database of potential buyers. In GU25's premium market, international marketing and connections to luxury property networks can significantly impact sale outcomes. Knight Frank and Savills offer extensive international buyer networks, while local agents like Buckinghams may have stronger connections to Surrey-based buyers. Ask specifically about their marketing of luxury properties and whether they utilize platforms like The Times, Sunday Times, or international luxury property publications.