Married Couple's Allowance could reduce your tax bill by between £322 and £835.50 a year. You can claim Married Couple's Allowance if all the following apply: you're married or in a civil partnership. you're living with your spouse or civil partner.
https://www.gov.uk/married-couples-allowance/overview
Very simple to do on line I have done it myself.
https://www.gov.uk/married-couples-allowance/overview
Very simple to do on line I have done it myself.