Witnesses to the marriage were William Knibbs and Phebe Nash.
George is identified as a 21 year old bachelor in the register. Harriet Jane is 25 years old.

George's father was George Albury, a coachman.
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We can see George and Harriet in 1871, living at 10 Gt. Westminster Street, Westmionster, Ondon, England:
George Albruy Head M 23 Groom North Hants Warnborough
Harriett J Albury Wife M 26 Machinist Oxon Woodstock
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George and Harriet can be seen in the 1881 census for England and Wales, living at Park Lane, Woodstock, Oxfordshire.
Living with them at that time was Harriet A Knibbs, daughter of Harriet's brother Henry Knibbs (who died in 1878) and Elizabeth (nee Bishop) from Kidlington, Oxfordshire.
George H. ALBURY Head M Male 30 North Harnboro, Hampshire, England Groom (N D)
Harriet J. ALBURY Wife M Female 36 Woodstock, Oxford, England Machinist (Glove)
Harriet A. KNIBBS Niece Female 4 Kidlington, Oxford, England
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In 1891, George and Harriet were living at The Grapes Inn, Yarnton Entire, Oxfordshire:
George H Albury Head M 40 Publican Hants North Warnborough
Harriett J Albury Wife M 45 Oxon Woodstock
Harriett A Knibbs Niece S 14 Oxon Kidlington

Harriet Annie Knibbs, the daughter of Harriet's brother Henry was still living with them, so I wonder if perhaps George and Harriet may have taken her into their own family after her father died and mother remarried.

The Grape Inn, Yarnton c.1900
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From Jackson's Oxford Journal, Saturday, May 21, 1892;
Wootton South Division Petty Sessions.
Before Hon. E. Ponsonby and Rev. Canon Bellairs.
William Passey, Sadler-Street, Oxford, general dealer, was summoned for being drunk at the Grapes Inn, Yarnton, on May 7th - Fined 20s. and 28s. costs.
Henry Nunn, 25, Penson's Gardens, Oxford, Labourer, in the employ of William Passey, was summoned for obstructing P.C. Tipping while in the execution of his duty at the Grapes Inn, Yarnton, on May 7. - Fined 5s. and 10s. costs.
The two above defendants were also charged with assaulting Harriet Jane Albury and Harriet Annie Knibbs at the same time and place. - Ordered to pay costs in each case.
Harriet J. Albury, Harriet A. Knibbs, and George H. Albury were summoned for assaulting W. Passey and H. Nunn at the same time and place. - Dismissed

George Albury was the publican of the Grapes Inn at the time. Harriet Annie Knibbs was the niece of George and Harriet Albury.

Harriet can be seen at the 1861 census return living at Islington, Middlesex, London
Harriett J KNIBBS 1844 Woodstock Oxfordshire Servant Islington Middlesex
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Harriet can be seen in the 1901 census for England and Wales, aged given as 53 years, living at Woodstock, Oxfordshire, England.
Harriet Albury 53 Oxon Woodstock Oxon Woodstock Glove Machinist
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Her sister Mary who married William Albury is also living alone at Woodstock in 1901.