If the power went out for a week or so, I is there any realistic way of heating in?

[uks]

For some reason we lose power 2 or 3 times a year it can be anything from a few hours to 3 or 4 days. We have a multi fuel stove with a backboiler to provide the main source of heat we also have a genny connected to operate the pump for the radiators, lighting and sockets. We use the minimum amount lighting, turn on the the fridge and freezer occassionally to keep the temp down and for the T.V.
We have a multi fuel colman camping cooker and also a gas camping cooker. This set up works great for us and when we lost power a few years back for 4 days in the middle winter we had a houseful of guest and kept old people supplied with hot meals and drinks.