Terrible service. I had arranged to have my gas and electricity meter changed to a smart meter and had 3(!) missed appointments. For all three I had to take half a day off work and was at home. None of the times was I contacted to inform me of any delay or rearrangement. On the third try I even called up their customer service center 3 times to say that I was concerned that it would be another missed appointment but was told that they could not contact the individual who had been tasked with the job. It was only on the fourth call (with 2 hours left in the day) that I insisted that someone contact the technician booked to do the job and was then told that they have been involved in a traffic accident (to be honest I do not believe this). If I did not call them I would never have known. Please stay away, it is not worth saving a few pounds against the stress and missed work that you will have to put up with.