Friendly, efficient service, job completed as agreed. Only minor issue was that they arrived 45 mins later than planned which in turn made me late for my appointments which was mildly irritating at the start. That said, from there on all went well and the job was completed same day, at around 6.45pm. Price was fair, and no VAT to pay (big bonus!). I will definitely use CH4 again and be happy to recommend to anyone; including my own friends and family.