A little bit of an odd question I know, but I have no idea to the answer. I currently have a friend living with me, his girlfriend also for the past couple of months! When he moves out how much do you think I will save on my energy bills? He has TV in his room with sky + PC, we have separte cooked meals as work different hours. At the moment spending around £40/gas and £35 elec. The hot water comes from a gas combi and the cooker is gas also. When he moves out I will be able to turn of the heating in the two rooms he has rented. Any ideas?