This is for British Gas & Electric, but even if you are using another provider it may be cheaper if you swap ?
"British Gas is offering a Winter Rebate scheme to their customers who receive
benefits including Disability Living Allowance, Carers Allowance, Child Tax Credits, Working Tax Credits, Incapacity Benefit, Severe Disability Allowance, Council Tax Benefit, Housing Benefit, Income Support, Income Based JSA, Pension Credit, Attendance Allowance, War Disablement Allowance/Pension.
Households buying gas and/or electricity from British Gas, where SOMEONE IN THE HOUSE receives these particular benefits, are eligible for the following rebates:
Gas £60 a year paid in 2 instalments - £30 in the last quarters bill in 2006 and £30 in the first quarters bill in 2007.
Electricity £30 a year paid in 2 instalments - £15 in the last quarters bill in 2006 and £15 in the first quarters bill of 2007.
Families need to phone 0845 601 2006 and have their British Gas and/or British Gas Electricity account number available. Registration is simple and effective for Autumn 2006 - Call 0845 601 2006