Excellent. Tony and his team arrived promptly at time agreed. Tony confirmed via text the day before the time he planned to arrive. They worked solidly for 10 hours with a short lunch break. System completely tested and Tony ran through the manual. Their attention to detail was exemplary to ensure customer satisfaction. All waste was removed and they cleaned up. Tony has serviced our boiler for 5 years, we would highly recommend him for any heating related jobs. A loverly, professional guy with a cracking sense of humour.