You may be able to get some grant funding to make your home more energy efficient. A lack of proper insulation and ventilation can lead to lots of other problems, like serious damp and mould appearing in the property. You might be entitled to money off the cost of insulating your home or you could get the property insulated for free.
Utility costs can be hard to budget for, particularly if you get a bill rather than using a pay as you go meter. You can switch your utility supplier if you can get a better deal elsewhere. There are lots of comparison websites about that can help you decide if switching supplier can save you money.