The gas that lights our stoves and the electricity powering our HD televisions may be pretty much the same wherever we live (unless we are conscientious enough to go green),but that doesn't mean that all households pay the same price.

Your postcode has a significant impact on the cost of heating your home because of the way that Britain's six biggest energy companies set prices. Here, we list the towns in the most expensive regions for gas and electricity, based on the latest researchfrom a price comparison website.

The survey looked at the average annual price for gas and electricity charged by the biggest six energy companies in different regions of the UK, based on a medium user customer using 3,300 kWh of electricity and 20,500 kWh of gas on an online dual fuel plan paying by monthly direct debit.

Households can significantly reduce their energy bills by switching to a cheaper tariff using a price comparison site. Switching is a quick and easy process and can knock hundreds of pounds off annual energy bills. Tariffs reserved for those who are willing to manage their accounts online are considerably cheaper than standard plans.

Compare here the best Gas & Electricity Deals

Here are the ten towns with the most expensive gas and electricity.

1 Cardiff - Bill: £949

2 Aberdeen - Bill: £924

3 London - Bill: £920

4 Bristol - Bill: £913

5 Liverpool - Bill: £906

6 Brighton - Bill: £894

7 Edinburgh - Bill: £893

8 Southampton - Bill: £893

9 Birmingham - £881

10 Manchester - Bill: £878