See Pension Credit extras. It's NOT automatic so you MUST claim – here's how. You can apply via Gov.uk if you've already claimed your State Pension, otherwise phone the Pension Service on 0800 99 1234 ...
Pension Credit tops up your weekly income to £218.15 if you’re single, or your joint weekly income to £332.95 if you have a partner - this will increase to £227.10 and £346.60 respectively ...
Eligible pensioners will receive up to £300. However, as the payment is only once a year you will need to submit your pension credit application far enough ahead to ensure you receive the benefit.
The Department for Work and Pensions (DWP) has confirmed the time it takes to process new Pension Credit claims - from initial application to award decision letter ...