By Niamh Kirk Keeping flies away has never looked – or smelt – so good. As summer approaches, so do the flies, unfortunately. As the warmer weather comes, people will start to open windows and let that summer breeze in – but there will inevitably be an influx of flies coming into homes. Though they’re harmless, the pesky home invaders can be frustrating as they buzz around your rooms. However, there is an easy – and visually appealing – way to keep them out, and it will cost just £4 or under. Luckily there are several houseplants you can have that will keep the flies out with strong scents, al…