Some would argue that the buyer can suffer, too. Christian Warman, director of Tedworth Property, a high-end London agency launched last week, received poor service when he decided to purchase a flat through an online firm. “I made a low offer, but before it was submitted they tried to sell me add-on services — conveyancing, insurance, mortgages, surveys,” he says. “I suspect this is where they make money, as they’ve no motivation to sell once the vendor has paid upfront.”