Having halved our gas usage in the last year or so, my top tips are:
• block up draughts with decorators’ caulk or squirt expanding foam into the big holes
• keep doors shut and only heat the rooms you need
• if you have a high-pressure water system (combi or unvented) use minibore pipe (10mm or 8mm) for direct feeds to each hot tap
• consider installing a Heat Recovery Ventilation Unit—it obviates opening windows and speeds up clothes drying in the house too.
• insulate under the floor if at all possible (and appropriate!)
• instal a solar water heater if you have a south-facing roof or wall
• consider installing a wood-burning stove or boiler
• add an enclosed porch
All the other basics are well-publicised; loft & cavity insulation, efficient boiler and white-ware, double-glazing, fit TRVs, room thermostats & good controllers, etc









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