Hundreds of thousands of pensioners in Great Britain may be missing out on Pension Credit, a significant financial support benefit aimed at low-income seniors, with around 880,000 eligible individuals not currently claiming. The Department for Work and Pensions (DWP) reports that this means-tested benefit can provide nearly £4,000 annually and includes support for housing costs and heating bills. Additionally, changes to the Winter Fuel Payment allow Pension Credit claimants to qualify for up to £600 in assistance. Martin Lewis's Money Saving Expert emphasizes the importance of checking eligibility, particularly for those aged 66 and older with incomes below £235 a week. A recent analysis indicates that up to 2.4 million Brits may also be owed tax rebates due to confusion over pension tax relief setups, with many unknowingly overpaying taxes. This situation highlights the critical need for financial awareness among older individuals regarding available benefits and tax relief options.