[2] A left-handed batsman and left arm medium pace roundarm bowler, Mills played mainly for Kent sides, including one match for the newly formed Kent County Cricket Club in 1843 at Hemsted Park near his home in Benenden.

[5][6] Benenden produced a number of fine cricketers and, in 1836, Mills played with fellow Kent and Benenden man Ned Wenman against a full side of 11 players from the Isle of Oxney on the border between Kent and Sussex.

[7] His brother, George, played occasionally for Kent sides between 1825 and 1829, making his debut in the same match as Richard.

[11] George also played in the 1831 Gentlemen v Players match, possibly a match which Richard had been invited to play in but, due to the method of addressing professionals simply by their surname, the invitation is reported to have been misunderstood.

[7][12] A benefit match was played for Mills in 1861 at Swifts Park in Cranbrook.