Hi,
Just been having a look at the Lancashire Parish Clerks website:-
www.lan-opc.org.ukI can see Esther's burial:-
Burial: 3 Apr 1814 Shaw Chapel, Oldham, Lancashire, England
Esther Brierley -
Age: 24
Abode: Nook
Buried by: J.Hordern
Register: Burials 1813 - 1828, Page 19, Entry 149
Source: Bishops Transcripts LDS Film 1545719
There are quite a few John Hiltons on Lancashire Parish Clerks too but no way of knowing which is the right one.
Lancashire Records Office might hold information about the Lancashire Militia - you could send an email to see what they have. The email address is:-
record.office@ed.lancscc.gov.ukThere is this website too:-
http://www.gmcro.co.uk/sources/mindex.htmand .... there is a John Hilton listed who was born in Oldham

.
Not sure if any of this is helpful .
Best of luck,
Luzzu