from Pallot's Index - Lankshear's 1788 to 1834

Lankshear, Mary
Spouse: Perkins, Wm Marriage Date: 1792
Parish: Holborn Middlesex
and Perkins, Wm
Spouse: Lankshear, Mary Marriage Date: 1792
Parish: HOLBORN ST ANDREW

Judy Lester very kindly checked PRs
St Andrew Holborn MARRIAGE
24 May 1792
William PERKINS, otp [no status]
Mary LANKSHEAR, otp [no status]
Banns Both signed Witnesses:  John Smith, Rd Perry [church employee]
That is what you call the bare bones -- what a pair of witnesses! 
Still, at least you know William and Mary got married!

From 1773 on - Thomas and Mary (Hammersly) Lankshear and children n Alvescot, Oxford

The Mary born in 1768 would seem to be a better age than this Mary - the original gedcom had 1768 Mary married to Margetts so I go with that.- but I am not yet satisfied that 1800  Mary LANKSHEAR marriage  John MARGETTS later they went to Tasmania is the 1768 Mary 

1851 census HO107/1731 Folio: 427
Mary Perkins abt 1773 Milton, Oxfordshire, England Lodger Witney Oxfordshire age 78 an Annuitant

And I suppose Mary in 1841 living with the LONGs  in Witney Oxfordshire
Elizabeth Green abt 1776 Oxfordshire, England
Elizabeth Long abt 1767 Oxfordshire, England
James Long abt 1796 Oxfordshire, England
Joseph Long abt 1829 Oxfordshire, England
Sarah Long abt 1811
Mary Perkins abt 1771 Oxfordshire, England
Harriett Phipps abt 1823 Oxfordshire, England

But Milton as place born in 1851 is kind of way south for one of our Mary's 

St Andrew Holborn

Actually there is a project by SoG to get the registers into computer form
details are here - I will write and ask about (4/2004)
http://www.sog.org.uk/projects/sah/safaqs.htm 

There was an update 6/2004 but nothing else as of Aug 2004

The registers are large and contain many thousands of entries, as the parish has always been a popular place to marry. More significantly, the entries from the marriage registers do not appear on the International Genealogical Index or in Boyd's Marriage Index. Pallot's Marriage index has entries for 1780-1837 but these give only year and omit many of the details from the original registers. It is for these reasons that the Society of Genealogists has decided to embark on the project to transcribe and index the registers