1851 shows both John and Mary born Eckington. The IGI has a marriage for a John Leak to Mary at Dronfield, which doesn't look far at all on a map, so it's a possible:
John Leak - Mary Fisher
2 April 1804 Dronfield, Derbyshire
Maybe these 2 children also belong to the same family:
Ann Leak 18 Jan 1807 Eckington, parents John and Mary
25 Jun 1809 Eckington, parents John and Mary