Following on from a hint in Mike Brown's papers. This is all very speculative and drawn from Chapelen le Frith registers.ie it is the only William of the right age and may be the right people being buried.
Parents of William Shirt (bapt 26 Feb 1786 born Downlee), married Ann Kirk?; John Shirt and Grace Ford married 26 Nov 1782.
James bapt. 17th Oct. 1790 born Lower Crossings Grace bapt. 13th Dec. Joseph bapt. 18th Jan. 1798
John died Towsend buried 8th Oct. 1836 age 73. Grace died Chapel Milton buried 8th June 1828 age 65.
Alternatively, did John die before 1800 and Grace remarry Joshua Shirt. (No evidence). A Grace and Joshua have a number of children in the right time scale and a Joshua despite being 10 years younger than Grace died at Chapel Milton, or is there another Grace?