I've been looking at how I could save energy, carbon, and money! Except, of course, that I can't. I could run my heating for fewer hours or at a lower setting. Except I'm already running it for two hours at 18, which is about the minimum. Any lower, and the damp cold begins to cling, and your house begins to fail at habitability and fall apart.
Insulation is going ahead, but it won't save me money. I've done the home energy calculators, which optimistically advised me that my saving per annum could be £113-117ish. This would require me insulating the loft, replacing three small single-glazed windows with double glazed windows, replacing the front door and either drylining or exterior coating my exterior walls (three sides of the property). It's obviously not going to save me money**, I'm unconvinced of the environmental benefits (everything involved will have a manufacture cost, after all) and in the end will come down to a purely selfish decision; something I do in order not to be cold, cold, wet, cold.
*We mostly used a stand of alder trees as fuel. They grow fast and chop easily, but the wood takes a long time to dry. We also burned coal and smokeless fuel, firelighters and other types of wood, including some things I'm sure you don't want to think about being chopped down and burned, like oak and yew.
**Please feel free to run my maths again, it's mildly amusing.