Came when he said he would, diagnosed the problem and made an appointment to carry out remedial work. Inspired confidence clearly had the appropriate kit to carry out the work - a high tech power flush of the system which had to my knowledge not been flushed in this way before. Showed me the evidence of how blocked the radiators were. Answered my questions patiently. Now awaiting a quote to replace the boiler, existing one over 20years old. Doug Heys inspires confidence.