You might be eligible for further help to pay your bills:
Winter Fuel Payment
If you were born on or before 26th September 1955 you could get a payment of £100-£300 towards the cost of your energy bills. There are full details of eligibility and how to apply here https://www.gov.uk/winter-fuel-payment
Cold Weather Payment
You might be able to get a Cold Weather Payment if you get support for mortgage interest, or certain benefits including income support, job-seekers allowance or pension benefit. You get a payment if the weather is on or below freezing for 7 consecutive days. Cold Weather Payments can start from 1st November, and you can get £25 per each cold week.
Warm Home Discount Scheme
The warm home discount scheme could get £140 off your electricity bill for winter 2021 to 2022. The scheme opens on 18 October 2021.
The money is not paid to you - it’s a one-off discount on your electricity bill between October and March. You might be eligible if you are on pension credit, or on a low income. More details here
Other sources of help
The British Gas Energy Trust help people in fuel poverty. You do not have to be a British Gas customer to qualify. More here https://britishgasenergytrust.org.uk/
Eon also provide support for existing customers: https://www.eonenergy.com/more-for-your-home/energy-fund.html as do
Octopus energy advice https://octopus.energy/blog/struggling-to-pay/