Ticket SupportAdvertise properties for sale and rent on NPA. Submit a ticket to contact us for specific or general enquiries. We will respond as soon as possible. Click here for frequently asked questions. Submit a ticket Click here to request the upcoming Auction Catalogue FAQs What is a reserve price? How soon can i sell my property by auction? Can I bid on behalf of a company? Can I sell prior to auction? Can I bid remotely? Corporate Headquarters Kemp House 152-160 City Road London EC1V 2NX Mon-Fri: 09.30 – 17.30