Prices in the shops are still on the rise and that goes for clothes too. Because of that, more of us are using second hand marketplace apps to shop on a budget. But can you really trust them to buy and sell? Which? Senior Lawyer Gurpreet Chhokar and founder of Savvy Marketing Catherine Shuttleworth talk us through the pros and cons of these sites, plus the popular scams you need to look out for. Find out how to stay safe while shopping second hand & sign up to our free weekly Money newsletter.