AF catheter ablation success rates are still limited to around 70% with a large proportion of patients requiring to have further procedures to remain in normal heart rhythm. The current strategies that are used in catheter ablation of AF involve targeting the pulmonary veins that enter the left sided upper chamber of the heart. The supportive evidence in targeting other areas beyond the pulmonary veins remains mixed. Thereby with the existing mapping systems other sites that potentially drive AF have not been effectively identified. Further to this, it has also been suggested that these sites are intermittent and mobile in nature making it more difficult to effectively map. With this in mind the investigators have developed STAR mapping, a novel mapping system that takes these factors into account. The purpose of this study is to use this mapping system prospectively to effectively map and ablate drivers of AF as identified by termination and/or slowing of AF during the catheter ablation.