I had a last look around
www.freebmd.org.uk/ for the English connection and think I have found the marriage
Marriages in the year quarter ending Sep 1847
FURLONG Philip Liverpool 20 392
Lockhead Robert Liverpool 20 392
Maguire Mary Liverpool 20 392
Moore Mary Liverpool 20 392
Moran James Liverpool 20 392
REDDINGTON Mary Liverpool 20 392
STAUNTON Martha Liverpool 20 392
TOOTLER Bridget Liverpool 20 392
so more information may be available on that marriage certificate.
I had started in ireland from Ros davies great website
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/SURNAMES/ some extracts for you to start with, you need to comb through allthe results. If there is a christian denominational known to you for Mary, then look up Ros Davies churches for Warrenpoint, she often identifies church records that are in existence.
Moor Esq. Warrenpoint a resident of Warrenpoint in 1824 POD
Miss Eliza MOORE . Warrenpoint daughter of John Moore ; married William Donnan 25 Jan 1850 CR
Miss Eliza MOORE . Warrenpoint daughter of John Moore ; married William Donnan 25 Jan 1850 CR
George Bartley MOORE . Warrenpoint husband of Anna Brady; father of male child b. 17 Sep 1869 CR
Margaret MOORE . Warrenpoint sponsor at the baptism of Catherine , daughter of Charles Neil & Catherine OHare 13 Sep 1834 at Warrenpoint Catholic Church PR
Mrs. Margaret MOORE . Warrenpoint daughter of Andrew Scott; a widow; married James Kenedy Thompson 28 Jun 1853 CR
Miss Margaret MOORE . Warrenpoint wife of John McKee; mother of male child b. 1869 CR
also I tried /www.bagenalscastle.com/ancestry which is good for newry and area
You searched for "Moore"
Source Number of Results
Calendar of Wills Newry 14
Crossle Papers 15
Flaxgrowers List 15
Householders Index 13
Kilmorey Estate Leases 7
List of Voters for Newry 1868 8
Newry Directory 1900 13
Newry householders, British Parliamentary Papers 10
Newry Model School 1849-1856 8
Newry Town Agricultural Census 1803 44
You can get other records for Moores living about 1840s-1865 in
http://griffiths.askaboutireland.ie/gv4/gv_familyWarrenpoint MOORE JAMES CHARLOTTE ST DOWN WARRENSPOINT
and Clonallan are neighbouring civil parishes
MOORE SAMUEL BALLYVALLY DOWN CLONALLAN
MOORE PATRICK BALLYVALLY DOWN CLONALLAN
MOORE WILLIAM EDENTRUMLY DOWN CLONALLAN
MOORE THOMAS MILLTOWN DOWN CLONALLAN
thie site has very detailed maps
for the purist Warrenpoint was spelt with a S in in Griffiths valuation ie Warrenspoint
Good luck onwards, Jim