The GRO clearly shows that Wiliam Noerth married Mary Ann Knibbs during q3/1882 in the Buckingham District.
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From the Bucks Herald, Saturday 26 August 1882:
Marriages.
North-Knibbs.—At the Wesleyan Chapel, on the 20th inst., by the Rev. J Hugill, Mr. William North to Mrs. Emma Knibbs, both of Buckingham.

Clearly, the newspaper reporter got Mary's name wrong.

Not sure if it's coincidental or not, but at the 1881 census, Mary was a widow living at Bone Hill, Buckingham. In the house next door, there was a widower named Joseph North, aged 73 years.

Pure speculation, but I wonder if this William North could be the next door neighbour's brother? Is there also a connection between Joseph and/or William North and the Cecelia North who married Mary's son John Knibbs?
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In 1901, we see a William North living at 4 St Rumbolds Lane, Buckingham, Buckinghamshire, and I wonder if this is him:
William North Head Wid 82 Hay Tier Bucks Buckingham

I'm told by Neil Bennett, descended from the same Sykes family of Deddington, that Mary's father was Thomas Sykes, a labourer, born 1790 in Evenley, Northamptonshire, and his wife Ann Mary Penn 1788 in Deddington, Oxfordshire. They married on 16 Feb 1815 at Deddington. Thomas died 6 Nov 1864 at Deddington. Ann died 1864 at Deddington. They had 4 children, all born in Deddington: William b.1816, Mary Ann b.1818, Benjamin b.1820 and Elizabeth b.1826.
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We see Mary Ann in 1841, living at Pilcock Street, Deddington. She was widowed:
Kilby Jos M 27 Sawyer Oxfordshire
Kilby M A F 23 Oxfordshire

I assume Joseph Kirby will have been a brother of her late husband, Thomas Kilby.
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From the Bicester Herald - 27 October 1865:
ANOTHER ASSAULT. Mary Ann Knibbs was, by Mary Ann Cobden, summoned for assaulting her. Knibbs pleaded guilty. Fine and costs, £1.
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From the Bicester Herald - 31 May 1867:
HOW ABOUT THE COPPERS THOMAS?
At the Magistrates' Chamber, Buckingham, on Saturday, May 25, before H. Thorpe and F. E. Bartlett, Esqs., Thomas Holton, of Buckingham, labourer, was brought up in custody charged with stealing five halfpence used for the purpose of playing "shove halfpenny". Mary Anne Knibbs deposed to their being on the table and to her missing them when the prisoner was gone out, and her sending a policeman to apprehend him.—Holton was remanded on bail in £10 himself and another to appear at petty sessions.
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Mary appears in the 1881 census as Mary A Knibbs, widowed, living at Bone Hill, Buckingham, Buckinghamshire, England
Mary A. Knibbs Lodger (Head) Wid 60 Charwoman Deddington, Oxford, England
Joseph North Head Widr 73 Hay Tier (Unable to Work) Bucks Buckingham

Joseph was identified as the Head of the household so I wonder, was he the owner of the house perhaps Mary was looking after him? - was the William North she married his brother? All pure speculation on my part.
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The Bucks Herald on 26 August 1882 reported a marriage at Buckingham on 20th August 1882 between William North and Mrs Emma Knibbs. The GRO has this marriage listed for Mary Ann Knibbs. I believe the GRO would be the more accurate source of information, so I presume this was a third marriage for Mary Ann Sykes.
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It's interesting to note also that Mary's son John Francis Knibbs married a girl named Cecelia North - any relation to Mary's third husband perhaps?
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There's no sign of Mary living at Buckingham in the 1901 census, but there's a William North, aged 82, occupation Hay Tier, so I wonder if this William North could be Mary's widowed husband?