Having played for the Middlesex Second XI since 1955, Day made his first-class debut for Middlesex in 1959, making two appearances against Kent and Cambridge University. He again wasn't required to bat in either of these matches, while behind the stumps he took a total of three catches and made four stumpings. In his Second XI career for the county, which spanned from 1955 to 1960, he never once reached double figures and was considered a genuine number eleven batsman.
He died following a fall at his Fulham home, on 19 January 1971 aged 35.