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.
https://www.gov.uk/cold-weather-payment
Warm Home Discount Scheme
The warm home discount scheme could get £140 off your electricity bill for winter 2021 to 2022. The scheme opened on 18 October 2021, and has now been extended to cover more households. This will soon be increasing to £150.
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
https://www.gov.uk/the-warm-home-discount-scheme
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
EDF https://www.edfenergy.com/for-home/help-centre/faq/can-i-get-grant-help-me-pay-my-energy
Octopus energy advice https://octopus.energy/blog/struggling-to-pay/