Which mosquito repellents are proven to work best? Whether you're staying in your back garden this summer or heading somewhere tropical, you'll be keen to avoid mosquito bites. There's a wide range of repellents claiming to help you do this, and avoid anything from a nasty bite to, for those travelling abroad, dengue fever or even malaria. For BBC Radio 4's Sliced Bread, listeners Nick and Yasmine want host Greg Foot to find out which mosquito repellents actually work. Nick wants to avoid bites when he is out walking, while Yasmine often takes family trips to Zambia, including to areas where malaria is a problem.