To clarify what you are requesting
Lifton I believe is a Devon parish (on the border with Cornwall).
http://genuki.cs.ncl.ac.uk/DEV/Lifton/index.htmlThe parish church is St. Mary the Virgin.
http://www.thirdman.ukhq.co.uk/church/dev-lifton-s.htmlStratton is in Cornwall. The parish church is St Andrew
Is it this Cornish entry from the IGI you are interested in
HANNAH MARTYN
Christening: 10 NOV 1757 Saint Stephens By Launceston, Cornwall
Father: JOHN MARTYN
Mother: ELIZABETH COWLES
Form submitted by a member of the LDS Church. The form lists the submitter's name and address and may include source information. The address may be outdated. Details vary. To find the form, you must know the batch and sheet number. So not sourced directly from parish registers themselves but from a Mormon church member in 1988.
So do you want someone to check the 1785 marriage in Lifton Devon to see whether Hannah's place of residency (less likely since marriages ususally took place in the woman's parish) was given as St. Stephens by Launceston?
Or you want someone to check the St. Stephens by Launceston parish registers to see if Hannah survived childhood and didn't marry in that parish? (National Burial Index has coverage only from 1813)
Or a check in Lifton parish registers for any Martyns in general?
These were the other church records at St Stephen by Launceston for Martyns submitted to the IGI by the same church member.
WILLIAM MARTYN
JOAN BOAR
Marriage: 26 AUG 1749 Saint Stephens By Launceston, Cornwall
JOHN MARTYN
Father: JONATHAN MARTYN
Mother: MRS. JOAN MARTYN
Spouse: ELIZABETH COWLES
Marriage: 09 OCT 1749 Saint Stephens By Launceston, Cornwall
JOHN MARTYN
Christening: 02 MAR 1755 Saint Stephens By Launceston, Cornwall
Father: JOHN MARTYN Mother: ELIZABETH COWLES
JANE MARTYN
DIGORY PAINTER
Marriage: 09 MAR 1761 Saint Stephens By Launceston, Cornwall
If it is a search in Lifton parish registers you want you probably need to do a further request on the Devon board.
Regards
Valda