A Bug's Life

I have nearly six years of monthly meter readings here. Monthly reading help me keep an eye on gas and move from "but it's so cosy" to "time to turn it off". The red and orange lines are the most recent years, there's been a new energy efficient tv and a small second freezer, and a new housemate who is rarely here. It's all over the place though, not a nice smooth 10 per cent reduction a year like the energy efficiency things seem to imply we should be striving for. The gas use seems more affected by temperature than number of occupants or any special measures. No idea where the electricity was going in the winter of 2010/11. The spike in Jun 2013 was the leak in the kitchen and running a dehumidifier for a month. Three-bed mid-terrace modern house with good insulation. Graph below...