During one of our cctv drain surveys, the footage revealed a host of drain flies within the drains. This isn't something that is going to cause a blockage but it could reveal something that may effect the property and was definitely something the owner wanted to be made aware of. If you are interested in booking a CCTV drain survey in London or the surrounding areas for your property visit our website. To find out more about CCTV drain surveys in London click here www.drain-smart.co.uk/cctv-drain-survey-in-london