First, try removing anything that could be the cause of the blockage. If this doesn’t work try using a toilet unblocker, which you can buy from many DIY or hardware stores or supermarkets. Please make sure you follow the instructions carefully. We recommend using foaming cleaner regularly (about once a month) to keep your toilet system clean and clear. It is your responsibility to ensure toilet systems are clean and clear. If an engineer attends and the blockage could have been cleared by you, it is likely you will be re-charged for this work.